Upping Our Global Game

SUNDARAM GUNASEKARAN, a professor of biological systems engineering, was recently selected to serve as faculty director of CALS International Programs.

Gunasekaran—or Guna, as he is widely known—has made his mark as a food engineer. His research focuses on the rheology of food, especially cheese. More recently, he has focused on applying nanotechnology and other methodologies as tools for pathogen detection and processing validation in foods.

But it’s his life experiences, along with his research prowess, that distinguish him as ideal for his new position. Guna’s international experience is geographically diverse. He received his bachelor’s degree in agricultural engineering from Tamil Nadu Agricultural University in Coimbatore, India, his master’s degree in food process engineering from the Asian Institute of Technology in Bangkok, Thailand, and his Ph.D. in agricultural and biological engineering from the University of Illinois at Urbana-Champaign. He’s been a visiting professor in South Korea, a Fulbright Fellow in Denmark, a USAID Farmer-to-Farmer consultant in Bangladesh and a mentor for a Syrian scientist under the Scholar Rescue Fund.

“I have also traveled widely and enjoy working with individuals and groups from different walks of life and interests,” he says.

As leader of CALS International Programs, Guna will identify and pursue international activities consistent with the college’s strategic goals. He will lead efforts to identify new resources for international activities and oversee the distribution of seed funding for new projects.

Why are international programs so important for CALS? 

The world has become very interdependent, and so have the problems we face. Many of today’s scientific challenges and practical problems can be solved not through isolated islands of intellectual pursuits, but rather by seeking out and incorporating ideas and approaches from different disciplines and across state and national boundaries.

Indeed, the scope of research and outreach performed by CALS faculty and staff extends far beyond the boundaries of the state and the nation. In a recent survey we found that more than 200 people in CALS have been working in about 80 countries around the world in various projects at one time or another. We are very engaged internationally.

International Programs can help elevate our international engagement from an “individual project” level to a more cohesive programmatic effort focusing on key areas of expertise in the college and implement a strategic framework for sustaining this activity in the long term.

What is your vision for CALS International Programs? 

My vision is for CALS to become one of the leaders among the nation’s land-grant colleges in international engagement, and for it to effect positive change in global agricultural, natural resource, energy, environmental and life science enterprises through research, education and outreach. We are a world-class institution, and CALS is among the very best land-grant colleges in the nation. Thus it is very appropriate that we envision an international program of similar stature.

How do we currently compare to other institutions? 

Other institutions have much larger international program activities. That’s something we want to see happen at UW– Madison.

Most major international collaborations deal with USDA and USAID projects. The United States government has resources to help developing nations solve their problems in securing a food supply, growing more food and developing infrastructure for storage, handling and distribution of food.

For example, the U.S. government has a large grant program called Feed the Future. We are one of the largest agricultural research schools that is not involved with that type of program. We are a player, but we are not considered to be a leader. That’s what I would like to help change.

How else is this work funded? 

In addition to funding from international agencies, there are local governments and private entities like the Gates Foundation. We also have support from alumni donors and alumni groups.

How has international research been changing over time? 

The United States is still a major intellectual and knowledge base—but now, as other countries and regions in the world are also growing their expertise, we can join hands and solve problems together rather than just being the problem solvers ourselves.

What are the hurdles to developing international research? 

Building relationships takes time. Normally if somebody is familiar with your institution or you as a person, that is the first point of contact. And then we get to know their strengths and needs, and then figure out how we can plug in our strengths and capacities. This kind of “feeling-out” process takes time.

We have to take time to travel and meet people and learn about their region and identify the problems they face there, and then identify researchers in Madison who have the capacity and the intellectual base to help solve some of those problems.

Does this process take resources away from our research endeavor here? 

On the contrary, it actually helps add to our research capacity and resources. Sometimes we develop a solution and international program activities provide additional resources to put that research output into action where it is needed. It takes some effort and capacity from our researchers to be able to focus their attention on international problems, but I don’t think it takes substantial resources away from what we are doing here.

How does international research enterprise affect students? 

We, as an institution, are responsible for developing future generations of citizens, and a student who is knowledgeable and well-versed in global issues and is sympathetic to different languages and cultures is a student who is able to solve the problems of the future. In that respect we believe that international engagement for students is critical for them to become future leaders and citizens of the world.

You held a number of listening sessions with faculty and staff from across the college to hear about their international work and their needs. What did you learn? 

The general consensus is: 1) they value international engagement; 2) they’re very active in it already; and 3) they’d like international programs to support their cause so they can do it more and better.

For example, they’d like us to help with their administrative needs so that they can focus on the technical and scientific aspects. Our office can help with budgetary issues, signing MOUs, and dealing with interinstitutional or intergovernmental issues. They also want to be more actively involved in large projects. So we are in the process of identifying opportunities where we can have multiinstitutional, multiinvestigator-based projects. It is something that individual investigators are not able to do, but that CALS International Programs can facilitate.

Beyond funding, are there other ways for alumni to assist in this effort? 

Certainly our alumni can be the spokespeople, our ambassadors. Especially our alumni who are internationally inclined, who have gone on a study abroad, or people from different countries who studied here and went back home—or even if they stayed here but still have strong connections back home. They identify with UW–Madison, and this is the institution they think of first when they think of collaborating, and so we become the first point of contact for them.

And when we go to another country, we look for someone who has been here, and they become our first point of contact—a resource center, so to speak, to help us navigate the local bureaucracy or culture. They become very valuable partners in this process. We have a number of examples of alumni we work with in engaging with different countries.

More Milk for China

Pamela Ruegg

Pamela Ruegg

Tell us what you are doing in China.
I’m leading an interdisciplinary team from UW– Madison in working with the Nestle company to help develop a $400 million Dairy Farming Institute (DFI) in northeastern China. Our role in this, through a three-year, $1.7 million agreement, is to develop a teaching curriculum for farmers, consultants, veterinarians and others throughout China.

Can you describe what the Chinese are trying to address with these dairy initiatives?
There is an enormous demand for animal proteins, specifically milk protein, in China. People want to feed their children high-quality proteins, just like we want to feed our children high-quality proteins. And one of the best ways to do that is with our very nutritious product, milk. This growing demand in China is so large that they’re estimating that, by 2020, meeting that need would require an additional volume of milk equal to the entire output of the dairy industries in Australia and New Zealand combined. And that need can’t bemet entirely by imports. So there’s a need to develop the Chinese dairy industry. The U.S. dairy industry and Wisconsin dairy suppliers are engaged in that work, and we are as well.

What can we here at CALS and in Wisconsin offer this new initiative?
Our role is a unique example of how the status of the Wisconsin dairy industry is recognized globally. We’re recognized here in Wisconsin as being leaders in the dairy industry, and they came to us because of that. The Chinese industry is seeking that knowledge base that we have here, they’re seeking the technology, and, specifically, the education we have here. They came to us and asked, “Could you help us develop a curriculum to help raise the overall level of our science knowledge base in a way that will result in safer and higher-quality food products?”

Please describe the project—how long is it going to last, how many people does it involve?
It will ultimately involve most people in the Department of Dairy Science and many people outside of it—for example, from the School of Veterinary Medicine and the CALS departments of biological systems engineering and agricultural economics. We’ve also got some curriculum designers from other colleges involved. As noted, our initial contract is for three years. The first courses took place this past fall—a threeday, introductory-level feeding course and a more advanced course about reproductive management of dairy cows. It is very likely that the project will go well beyond the three-year initial course development period. The institute itself is meant to be permanent.

How did the first courses go? Who taught them and what did they report back?
Both initial courses were fully subscribed, and all indications are that they were very well received. The learners especially liked the practical, on-farm training and case studies that reinforced the scientific principles that made up the lecture portions. For the first offering of these courses, several ofour faculty and staff from dairy science—professors Dave Combs and Milo Wiltbank, along with outreach program manager Karen Nielsen—flew to China to participate in the opening ceremony for the DFI and to work alongside industry partners and Chinese DFI trainers in delivering the classes. Ultimately, after the trainers are fully competent with the course material, level 1 and 2 courses will be offered without direct teaching by UW faculty. We will continue to develop and revise curriculum for these levels and provide oversight and quality control. Higher-level courses for veterinarians and top managers will continue to be taught by UW faculty.

Describe the partnership with Nestle.
Nestle is the leader and the primary initial investor in the Dairy Farming Institute, but there are partners from all around the world, including our own dairy farmers here in Wisconsin. Land O’Lakes, which is, of course, a cooperative, is the feed partner at the Dairy Farming Institute. And there are other companies in Wisconsin as well who have invested in the Dairy Farming Institute. Our participation is also meant to support their success.

How may this benefit the state of Wisconsin?
It will certainly lead to additional opportunities for our students here. We’re hoping that as this institute gets off the ground, we’ll be able to offer internships and have student exchanges. We also, through our participation, are supporting the Wisconsin businesses.

“We’re hoping our participation will enhance the markets for Wisconsin agribusinesses.”

Can you please look into your crystal ball for a moment and imagine what the Chinese dairy business might look like five years, 10 years, 20 years from now?
The first time I went to China was 10 years ago, and in that 10 years it’s just been remarkable, the transformation of that industry. The industry is rapidly growing. There’s a lot of investment in it. This particular project is meant to stimulate the development of Wisconsin-style farms—midsize dairies, for the most part, that are owned by private entrepreneurs, private farmers just like here. The goal of Nestle is to kind of replicate what we’ve got here that’s so beneficial for our state and our industry, where we have a lot of independent producers producing milk in a very sustainable fashion.


Pamela Ruegg , DVM, is a CALS/UW–Extension dairy science professor and milk quality specialist whose expertise has taken her around the world. She has done international consulting work on milk quality and safety as well as enhancing on-farm implementation of best management practices to improve herd health. Her latest work has taken her to the northeast province of Heilongjiang, China, where the Nestle company is establishing a dairy training facility. The Dairy Farming Institute is a key element of Nestle’s effort to establish a larger, more reliable source of high-quality milk to supply its processing facilities in China. The institute will include a training center and three demonstration farms to teach farmers and dairy industry professionals the skills needed to manage larger, more sophisticated dairy operations. We sat down with Ruegg to discuss the university’s role in it.

Keeping Track of Wolf Deaths

Tim Van Deelen, a CALS professor of wildlife ecology, specializes in the management of large mammals, including population estimation and dynamics, hunting, interaction of deer life history and chronic wasting disease—and, not least, the growth of Wisconsin’s wolf population and its effects on white-tailed deer.

As this year’s wolf hunt season opens in Wisconsin, we talked with him about a hidden and disturbing topic: illegal killing, which Van Deelen says may have increased in recent years. Much of the data on this subject, he says, comes from work by his former doctoral student Jennifer Stenglein MS’13 PhD’14, who is now a wildlife researcher with the Wisconsin Department of Natural Resources.

Can you give us an idea of how wolves die?
As we know from radio collaring data, wolves die for a variety of reasons. Wolves in Wisconsin have relatively high mortality rates, and that probably has to do with the fact that they’re living on a landscape that’s much more highly impacted by humans than, say, northern Canada or Alaska. We have higher levels of wolves getting hit by cars, especially as they begin encroaching parts of central and southern Wisconsin where we have higher road densities.

Wolves are also territorial, so on the margins of their pack territories or where there are territorial disputes between packs, wolves will kill each other.

Wolves die of disease. We’ve had deaths due to parvovirus and mange. Wolves sometimes starve to death if they can’t get enough prey or if they’re old or injured and otherwise inefficient as hunters.

There’s also a fair amount of unexplained mortalities that we have from radio tracking data.

Can you elaborate on that?
We have radio-collared wolves that outlive the radio collars—that is, they outlive the battery that powers the collar—so you have a record that starts when the animal is radio-collared and ends when you stop getting signals. Understanding mortality rates at the population level requires you to make some decisions about how you’re going to treat those animals once the record stops.

Research that my graduate student has been doing suggests that a fair number of those animals are dying.

Do you suspect illegal killing?
Well, the problem with illegal killing is you don’t observe it. You can’t point to something and say, “That wolf died from illegal killing,” but you need extra mortality in the system once you explain everything else in order to reconcile the mortality rates that we’re seeing with the reproductive rates that we get from the pup counts and the growth rate that we see from the annual population counts.

So there’s a missing gap in the data of why some animals disappear.
Right. The basic population dynamics equation is very simple. It says that the number of animals born minus the number of animals dying is the net addition or subtraction from the population. If we have a population that we can count every year like we do with wolves—we count them every winter—then we can mathematically fit an equation to that growth using things like observed deaths and estimated reproduction.

When we can’t get that to reconcile, then we need some additional deaths that are unobserved to make the growth rate that we see agree with the mortality and the reproductive rates that we’re measuring.

The suspicion is that many or some of those unobserved deaths are due to illegal killing. Because from our radio tracking data we do have good estimates on the relative amounts of deaths that are due to other things, like being killed by other wolves or dying of disease or being hit on the road.

What would prompt illegal killing?
Human dimensions research done at the Nelson Institute suggests that people living in wolf range have a sense of frustration that many people think traces back to this on-again, off-again listing of wolves under the Endangered Species Act.

We went through a period where the wolves would be de-listed, or there would be movement toward de-listing, and then somebody would step in, the courts would intervene, and the wolves would become listed again.

There’s good human dimensions research in wildlife that says that attitudes toward wildlife tend to degrade when people feel like they have no options for dealing with the problems that those wild animals are causing.

When wolves are put “off limits” because of the Endangered Species Act, then people who are experiencing problems with wolves, real or imagined— their attitudes toward wolf conservation begin to degrade.

That aligns with some of the research that’s been done on this campus suggesting, among other things, that people who are interviewed in the
north say they’d be more willing to illegally kill a wolf if the opportunity presented itself. More people are saying that now than in the early 2000s. That time period aligns with the growing frustration people have experienced over de-listing.

How many unexplained wolf deaths are there?
About 20 to 30 per year, in our best estimate. That’s been from the period 1980 to 2013, where we fit the models. There’s evidence that it’s been increasing recently. By “recently,” I mean within the past five or 10 years.

Can you please elaborate?
During the early part of the growth phase of wolves in Wisconsin (1996– 2002) the wolf population averaged about 200 wolves during midwinter counts. We estimated that about 43 of these would die during the year, and unobserved deaths were likely not needed to reconcile observed popula- tion growth. During the latter part of the growth phase (2003–2012), Wisconsin’s wolves averaged about 600 wolves, and about 138 of these would be expected to die during the year. However, you would also need another 24 dead wolves to reconcile the rate of population growth observed. These 24 would include a mix of natural and human-caused subtractions, including an unknown level of illegal killing. The change from 1996–2002 to 2003–2012 suggest that illegal killing may have increased.

What kinds of conflicts do people have with wolves in Wisconsin?
Probably the most important right now are conflicts with livestock producers. We have a handful of areas in Wisconsin that are hot spots where there’s been sort of long-term chronic depredation by wolves on livestock.

That’s a real problem—and fortunately in Wisconsin, the Department of Natural Resources has a partnership with USDA Wildlife Services. They have professional USDA trappers who can go in, verify whether a calf or a cow was killed by wolves, and then help the landowners either by excluding the wolves from the territory or by trapping and euthanizing the wolves that are causing problems. They’re very professional, they’re very good at what they do, and they’re very successful.

Another problem in Wisconsin is wolves depredating hounds. These are mostly hounds used for hunting bears and smaller carnivores. If you’re running hounds late in the summer, that’s when the wolves are provisioning their pups at rendezvous sites.

The wolves probably interpret that incursion as an invading pack, so they would attack and kill those hounds. That happens, that’s an issue to deal with. DNR has been proactive with trying to identify those areas where depredations have occurred and might be more likely, and warn people to avoid those areas with their hounds if at all possible.

There’s a lot of talk about wolves having impacts on deer in the north. In some places, that’s probably a reality. In some places it might be more perception than reality. At a statewide scale using the harvest statistics, we just haven’t seen a real impact of wolves, but that’s sort of a coarse-filter approach.

We have two deer research projects going, one in eastern farmland and one in the northwest. We actually don’t find a whole lot of wolf predation on adult deer, which would be the mechanism by which wolves would have the most impact on the deer herd. Still, if you’re the unlucky individual whose hunting spot happens to be sitting right on top of a wolf rendezvous zone, you might not be seeing very many deer.

What would you like to see done with wolf management going forward?
One of the unique things about wolf management in Wisconsin is that we’re managing this population now at a pretty high exploitation rate—meaning that we’ve got heavy harvest seasons. Those are designed explicitly to reduce the wolf population.

Harvest management theory would suggest that there’s some danger of long-term instability. I think the most important thing that managers of Wisconsin’s wolf population need to do is keep putting efforts into monitoring the wolf population—tracking population trends, tracking the extent to which wolves live on the landscape. Those are the measurements you can use to identify some sort of instability and then be able to deal with it.

To be fair to the managers, they know that, they’re working on that. We’re collaborating with them to come up with more cost-effective ways to get the sort of information they need to track population trends.


A Groundbreaking Gut Check

You might expect that the most important break- through in feeding dairy cattle in years would rate
a snazzy name. Instead, you get “total tract neutral detergent fiber digestibility”—TTNDFD for short.

“Yes, I know. That’s a terrible name. But unless someone comes up with something better it’s TTNDFD,” says CALS dairy nutrition scientist David Combs.

No matter. For an idea this good, a clever name isn’t needed.

The discovery of TTNDFD, a new forage test, lays to rest a mystery that’s perplexed researchers and dairy farmers since scientific forage analysis began 40 years ago: Why cows would wolf down one finely tuned dairy ration but turn up their noses at another that, on paper, was identical?

“We couldn’t put a finger on it,” Combs says. “You’d get your forage analysis, balance the ration, and everything seemed fine. But one time the cows would eat everything up, the next time you’d get a high rate of refusal.”

That mystery cost money. When cows eat to capacity, they produce milk to capacity, and milk sold off the farm is what pays the bills. “It wasn’t so much good forage, bad forage. Those things we can detect. It was those times when everything seems fine and the cows would not eat as much as expected or not produce as well as before,” Combs says.

Cows are professional eaters and highly discern- ing about what gets served. They’ll eat a lot of differ- ent things but will eat a great deal more of the things they like best. What the Combs team figured out— through research that involved 20 years of reaching into the 30-gallon vats known as cow rumens—was that how much cows gobbled up and turned into milk was influenced by the rate of fiber digestion. Developing a test to account for it ushered in a new feeding system that offers several advantages.

For one, the new forage fiber test lets farmers
see the differences in the feeds they have on hand. For another, it helps them grow and buy the types of feeds most favored by cows. For yet another, plant breeders can use the test to create the type of crops cows want the most. And most important, the test can help milk producers make more money.

“How fiber is digested can easily make five to six pounds per day difference in milk production in a dairy cow,” Combs says.

There could also be some positive ripple effects. As people applied the test to all kinds of forage, they discovered that grass is something of a magic missing ingredient in the daily dairy diet. The right kind of grass is really good for cows, and the test can help farmers select the right grasses to grow.

Reintroducing grass to dairy diets on a large scale could be great for the landscape. Grass soaks up carbon and nutrients, holds soil in place, covers otherwise bare ground during the winter, and can help absorb manure applications.

The test also opens opportunities for entrepre- neurs. When Rock River Labs in Watertown hired John Goeser BS’04 MS’06 PhD’08, who’d earned a doctorate under Combs, it became the first lab in the world to offer this new analysis to the dairy community.

“It’s started a little slow. But it went from no
tests to 5,000 tests in a season,” Combs says. Now Combs uses a large spreadsheet to review the data being generated by thousands of TTNDFD tests performed by Rock River. More labs are looking into offering TTNDFD results as part of a forage analysis package.

Upping the Orange

Sherry Tanumihardjo is a CALS professor of nutritional sciences and director of the Undergraduate Certificate in Global Health, a popular new program that draws participants from majors all across campus. She has almost three decades of experience working with vitamin A, and her research team has conducted studies in the United States, Indonesia, South Africa, Ghana, Burkina Faso and Zambia. Tanumihardjo has acted as a consultant to many studies throughout the world to assist with study design and appropriate standardization. She is a strong advocate for the promotion of nutritionally enhanced staple foods, vegetables and fruits to enhance overall health and well-being.

Describe your work with orange vegetables.
I have worked for a number of years on carrots of many colors as well as on orange-flesh sweet potato and, more recently, orange maize. Basically we are trying to improve the vitamin A status of individuals by having them consume more orange fruits and vegetables in general.

Can you give us an idea of how you go about doing that?
For many years I have worked with carrot breeder Phil Simon in the Department of Horticulture. He was breeding carrots for more orange color. We did a series of studies in both an animal model and in humans, trying to look at the uptake and distribution of the carotenoids that give the vegetables their orange color—and the vitamin A that is made from the carotenoids. Then we moved on to orange vegetables in humans in Africa. I have worked with orange-flesh sweet potato in South Africa and with orange maize in Zambia.

Can you describe the connection between the color and the nutritional value?
There are three well-known precursors of vitamin A that are called pro-vitamin A carotenoids. Those are beta-cryptoxanthin, alpha-carotene and beta-carotene. Many of you may have heard of beta-carotene because it is one of the compounds found in many over-the-counter supplements. But those are also the compounds that give carrots and orange maize their bright orange color.

What happens if there is not enough vitamin A in the diet?
The most drastic thing that can happen is death. So we go around trying to get people to improve their vitamin A intake not only to prevent death—there are many steps before that happens, and one of them is blindness. Vitamin A is extremely important in vision and it also helps us ward off disease, so it’s a very important vitamin.

How did you get started in Africa?
It actually started very slowly. I used to be a consultant and I would fly back and forth to different countries to help them look at study design. The sweet potato study was funded by the International Potato Center. I helped them design the study, they did the school implementation—a feeding study—and then I helped them get the work published. My work with orange maize started in 2004 in collaboration with HarvestPlus, a project managed by the International Food Policy Research Institute. We started working with animal models and then progressed to full-fledged feeding trials, the latest of which we finished in 2012.

What were some of the challenges in your work in Africa?
The challenge is that feeding trials, if they’re going to show what we call efficacy, have to be highly controlled. So that means you have to keep the children for long periods of time and feed them all of the foods—and the foods need to be the same across the group except your test food. So in South Africa we fed orange-flesh sweet potato to half the children and white-flesh sweet potato to the other half. And then when we moved on to orange maize we did two studies. One study was similar to the sweet potato study where we fed white maize and orange maize. And then we did a second study where we had three groups, which got a little more complicated. We had white maize, orange maize and then white maize with a vitamin A supplement.

Another challenge is that all of the human work that I do involves blood—so we have to take blood from these children. Vitamin A in the human body is stored in the liver, and we use indirect markers of liver reserves of vitamin A that you can pick up from the blood.

Looking down the road what kind of goals do you have for your research?
We would like for people to have optimal health by having a diet that has not only all the nutrients you need but also some of the potential compounds that gear us toward optimal health. So it’s not just about fighting blindness anymore, but to see if we can get people into a new nutritional state where they are actually able to ward off diseases such as cancer.

What kind of progress have you made?
We have had significant progress with sweet potato. Most people in Africa used to eat white sweet potato, not the orange sweet potato we eat here in the United States. Many countries in Africa have now adapted the vines to be orange-flesh sweet potatoes. We think that’s a success story. Regarding orange maize, there are three lines of orange maize that have been released by the Zambian government. Currently orange maize is available to consumers. Right now it’s at a premium price, but hopefully with time the price will come down to the level of white maize.

How did you get interested in this line of work?
It chose me. It wasn’t something that I was looking for, but I was working with vitamin A and if you’re working with vitamin A and status assessment, it’s going to draw you to the countries that may have a history of vitamin A deficiency.

Can you talk a little more about the international nutritional programming you’ve been involved in?
Most of the work that I’ve done is to support biochemical labs. We have not done a lot of nutrition education on the ground, although that is a goal of mine, especially in Zambia. We have discovered that Zambians actually have really good sources of vitamin A in their daily diets, so we want to help them continue to eat the fruits and vegetables that are good sources of those phytonutrients and vitamins and minerals.

The other thing that I work on is isotope methods, which sounds a little scary!

What are isotope methods and what do they do?
We work with a compound called 13C. Typical carbon in the human body is 12C and radioactive carbon is 14C. We are working with the form of carbon that constitutes 1 percent of the human body. It’s perfectly safe to use, but it also has allowed me to work with the International Atomic Energy Agency. That’s the same agency that oversees radioactive bombs in different countries, so it’s kind of interesting that they have something called Atoms for Peace. And they actually received the Nobel Peace Prize one year based on the safe use of isotopes in nutrition.

I have worked in several countries trying to help them understand isotope methods and to apply isotope methods at the population level to inform public health policy. It’s a very technical method, but it can answer questions of public health significance.

So it’s a research tool. And what kinds of questions does it answer?
It is the most sensitive marker of liver reserves of vitamin A. Basically what we do is we give a dose of vitamin A that has a slightly higher amount of 13C than what’s found naturally in the environment, and then we can follow the uptake and the clearance of that 13C in the human body. And from that we can calculate total body stores of vitamin A—how much is in the whole body.

To conclude here, there’s an interesting story about your office and a more recent career development of yours—serving as director of the Undergraduate Certificate in Global Health, a program you helped develop and launch in 2011.
Yes. The Nutritional Sciences Building was originally a children’s hospital, and this particular office that I sit in sat idle for many, many years, used only for small committee meetings and things like that. When we received funding for the Undergraduate Certificate in Global Health, I looked in this office again and realized that it now fits my purpose. Originally it was the viewing room for children who had died from a variety of diseases, and the parents would sit in this room and mourn their lost child. I decided that this room fit my new mantra at the university, which is to empower undergrads, to mobilize them, to try to change the world. And while I’m sure we won’t have 100 percent participation, we’ve already had about 1,000 students go through the program.

Tasty Solution

After having a stroke in 2008, Jan Blume lost the ability to swallow for two full years. As she slowly regained that vital function, she faced a new challenge: drinking the thickened beverages that are recommended for people with swallowing problems, or dysphagia. She found the drinks almost intolerable.

“They taste bad and the texture is so weird,” recalls Blume, a retired nurse living in Appleton who can now eat and drink whatever she wants. “At some point, I would have just stopped using them—and either done okay or developed problems.”

Fortunately there may soon be a better beverage option for people with swallowing problems, thanks to collaboration between a dysphagia specialist at the UW–Madison School of Medicine and Public Health—and a candy expert at CALS.

It started by chance when JoAnne Robbins, head of the medical school’s Swallowing, Speech and Dining Enhancement Program, asked CALS food scientist Rich Hartel if she could borrow his viscometer, a device that measures viscosity, or the thickness of fluids.

“After learning that one of Rich’s areas of expertise was chocolate, I mentioned that there are all these awful-tasting drinks made for people with swallowing problems, and nothing in chocolate,” recalls Robbins, a professor of medicine with an affiliate position in the CALS nutritional sciences department. “So we decided to develop a thickened chocolate drink together.”

The biomechanical events of swallowing are complex, involving 40 sets of muscles. Many things—including injury, illness and natural muscle atrophy due to aging—can cause dysphagia, which afflicts some 18 million adults in the United States.

The condition can be embarrassing. Some people with dysphagia simply stop going to restaurants or even eating with their families at home due to the struggle to swallow or the length of time it takes them to finish a meal. “This can have a devastating impact on social structures,” says Robbins.

But it’s more than just a quality-of-life issue, notes Robbins. Dysphagia can cause dehydration, hunger and malnutrition. Worse, if people with dysphagia aspirate liquids or food into their lungs, it can lead to pneumonia—and possibly death.

Many patients with dysphagia are advised to drink thickened beverages, which tend not to leak into the airway. But these products often leave much to be desired, and not just because of a bad flavor.

“The commercial products that are out there don’t match the diagnostic standards. So people think they’re buying a ‘nectar thick’ beverage, which is supposed to be a certain viscosity, but it’ll turn out that it’s not even close,” says Hartel.

That’s where Hartel and Robbins figured they could help: by developing what they call “bio-
physically based fluids” that match the diagnostic standards—making them safer for patients to drink—and that also taste good.

With the support of a U.S. Department of Agriculture grant, Hartel analyzed 15 thickeners and developed beverages using a handful of them. Robbins tested the drinks for safety in her patients, and a third team member, University of Minnesota researcher Zata Vickers, gathered key sensory data.

Ultimately the team gave up on chocolate after reading a number of studies showing that citrus flavors elicit a faster, better swallow. They are in the process of patenting their beverage technology through the Wisconsin Alumni Research Foundation, and are excited for the day when people who must drink thickened beverages—as Jan Blume did—will have a safer, tastier option.

“I’m in this to make my patients feel better,” says Robbins. Of her CALS collaborator Robbins says, “Rich is a very good partner. He was open to expanding the focus of his research program. He liked the idea of helping people directly.”

Will Dead Species Live Again?

Stanley A. Temple is the Beers-Bascom Professor Emeritus in Conservation in forest and wildlife ecology at CALS and a former chair of the conservation biology and sustainable development program at the Gaylord Nelson Institute for Environmental Studies. For 32 years Temple occupied the faculty position once held by Aldo Leopold, and while in that position he received every University of Wisconsin teaching award for which he was eligible. Since his retirement from academia in 2008 he has been a Senior Fellow of the nonprofit Aldo Leopold Foundation. He and his 75 graduate students have worked on conservation problems in 21 different countries and have helped save some of the world’s rarest and most endangered species. Last spring Temple gave a TED talk at a special event devoted to de-extinction, a concept that has captured the imagination of scientists and the general public alike.

What is “de-extinction”?
De-extinction is a recent term that involves bringing back an extinct species using DNA that’s been recovered from preserved material. There are two ways that it can be accomplished: one would be cloning to produce a copy of an extinct individual’s genome. The second way is through genetic engineering to re-create a close approximation of what the extinct species’ genome might have once been. The reality is that it’s no longer science fiction. We’re getting close to being able to revive extinct species from recovered DNA.

This must make for some unusual scientific partnerships.
It’s an interesting synthetic endeavor that matches the biotechnologists in the laboratory with conservationists in the field. The biotech crowd will be responsible for recovering DNA from an extinct species and through either cloning or engineering turning that DNA into individuals. But once they’ve done that, the next step involves people like myself who know how to recover endangered species by taking a small number of individuals and turning them into a viable population and getting them back into the wild.

What opportunities might this technology present to conservation efforts?
On the plus side, obviously, it would be exciting to bring back a species that human beings drove to extinction. But even if we weren’t able to do that, the technology presents an appealing opportunity to recover DNA from preserved specimens of an endangered species and use it to enhance the genetic diversity of the surviving population.

Can you please elaborate on that?
Conservationists have recovered many endangered species from very low population levels and saved them from extinction. The problem is, they’re often genetically depauperate, or lacking in genetic diversity. If we can recover some of the lost genes from preserved specimens collected before the population crashed, we might greatly improve the species’ prospects for long-term survival.

How would a conservation biologist go about actually applying this?
De-extinction is still an unproven concept, but it’s likely that sometime in the coming decades it will happen. Once they have revived individuals of an extinct species in the lab, then conservation biologists could try to recover the species by captive breeding and reintroducing the species to the wild. But conservation biologists get concerned about some of the details: Which species are going to be revived? Are they the right species? Are they the species that have the best chances for long-term survival in the world today? Are they species that might actually enhance the ecological health of the ecosystem that they were once part of, like the wolves reintroduced to the Yellowstone ecosystem? These are all questions of setting priorities for which species to actually revive.

How would you recommend setting priorities?
As a conservation biologist I would certainly look first at recently extinct species that were affected by a threat we’ve now overcome. Not only are those the ones for which we’re likely to have good quality DNA, but their ecological niche in the wild hasn’t been vacant for very long. And as a result, the ecological community that they were once part of has not readjusted itself to their absence, and might once again easily accommodate the species in its midst. On the other hand, if you’re dealing with a species that’s been extinct for a very long period of time—centuries or even millennia—the ecosystem that they were part of has moved on, and a species like that, once back in the system, could essentially be the equivalent of an invasive species. It might disrupt the system and threaten extant species.

How would you like to see this development proceed?
Considering the timeline that we probably have years or even decades to do this right—I and other individuals and groups that are thoughtful and somewhat skeptical about this would like to see a very broad discussion of the implications. We would like to see a lot of input in deciding the priorities about which species to bring back. We would not like to see this done in secret, which, unfortunately, is where this seems to be heading. This very expensive work is not receiving government funding and doesn’t have any sort of public oversight. Hence, privately funded biotech labs seem to be focusing on reviving spectacular extinct species, like mammoths and other Ice Age animals, rather than species that have a real chance of surviving in today’s world.

What would be an important takeaway point for the general public?
De-extinction doesn’t mean we can ignore the significance of extinction—to think, “Oh well, we can let species go extinct because we can always save some DNA and bring them back later.” This would just be an open door for activities that have been constrained by concerns for biodiversity and basically give the green light to go ahead and precipitate extinctions of species that are already with us.

Protecting our Pollinators

People and bees have a long shared history. Honeybees, natives of Europe, were carried to the United States by early settlers to provide honey and wax for candles. As agriculture spread, bees became increasingly important to farmers as pollinators, inadvertently fertilizing plants by moving pollen from male to female plant parts as they collected nectar and pollen for food. Today, more than two-thirds of the world’s crop plants—including many nuts, fruits and vegetables—depend on animal pollination, with bees carrying the bulk of that load.

It’s no surprise that beekeeping has become a big business in the farm-rich Midwest. Wisconsin is one of the top honey-producing states in the country, with more than 60,000 commercial hives. The 2012 state honey crop was valued at $8.87 million, a 31 percent increase over the previous year, likely due in part to the mild winter of 2011–2012.

But other numbers are more troubling. Nationwide, honeybee populations have dropped precipitously in the past decade even as demand for pollination-dependent crops has risen. The unexplained deaths have been attributed to colony collapse disorder (CCD), a mysterious condition in which bees abandon their hives and simply disappear, leaving behind queens, broods and untouched stores of honey and pollen. Annual overwintering losses now average around 30 percent of managed colonies, hitting 31.1 percent this past winter; a decade ago losses were around 15 percent. Native bee species are more challenging to document, but there is some evidence that they are declining as well.

Despite extensive research, CCD has not been linked to any specific trigger. Parasitic mites, fungal infections and other diseases, poor nutrition, pesticide exposure and even climate change all have been implicated, but attempts to elucidate the roles of individual factors have failed to yield conclusive or satisfying answers. Even less is known about native bees and the factors that influence their health.

Poised at the interface of ecology and economy, bees highlight the complexity of human interactions with natural systems. As reports of disappearing pollinators fill the news, researchers at CALS are investigating the many factors at play—biological, environmental, social—to figure out what is happening to our bees, the impacts of our choices as farmers and consumers, and where we can go from here.