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  • Animal Science
  • Animals
  • Food

Global food producers face increasing pressure to meet sustainability and nutritional demands. As a result, farmers need practical solutions to produce more food while minimizing environmental impact and ensuring both animal and human health.   

Keith Ou '25, a graduate student in the Department of Animal Science, conducts animal nutrition research to tackle these challenges — bridging animal agriculture and human nutrition. Ou works with Xingen Lei, professor of molecular nutrition and associate dean of the office of research and innovation. One key focus of the Lei lab is identifying alternative feed protein sources to replace soybean meal in animal diets. This could help mitigate competition between food and feed sources, as well as lessen environmental impact. 

“We’re testing animal diets using byproducts from other agricultural processes,” Ou said, citing examples like hempseed meal and microalgae. “These are valuable and safe resources that would otherwise go to waste.”

Hempseed is protein-rich and contains high levels of essential amino acids and fatty acids. A byproduct of industrial hemp, it presents a promising sustainable alternative to soybean meal, potentially reducing agricultural waste.

“Our research helps provide a more complete picture of the impact of novel feed ingredients, including safety and nutrition,” Ou said. In a recent study, he assessed the nutritional benefits of supplementing hempseed meal in the diets of laying hens, examining its effects on egg production and nutrient composition. 

“We found that feeding chickens up to 15% hempseed meal in their feed had no negative impact on body weight, feed intake or egg production,” he explained. “It also significantly increased omega-3 fatty acid levels in their egg yolks.” Additionally, the research showed that hens fed hempseed meal produced lower emissions in the manure compared to the control group, suggesting that hempseed meal supplementation could contribute to reducing greenhouse gas emissions from poultry farming.

I originally wanted to go to vet school and become a zoo nutritionist. But I realized I was more interested in the molecular side of nutrition.

Originally from California, Ou earned a Bachelor of Science in animal science with a minor in nutrition from California Polytechnic State University. His experience includes work in animal care at the Oakland Zoo and in animal nutrition at Disney’s Animal Kingdom. “I originally wanted to go to vet school and become a zoo nutritionist,” he said. “But I realized I was more interested in the molecular side of nutrition, particularly micronutrients and their role in animal diets.”

Ou also conducted research examining biofortification, increasing the nutritional content of food through changes in an animal’s diet. In a recent study, he explored the potential of biofortifying animal products like eggs with essential nutrients. His work successfully enriched eggs with important nutrients including docosahexaenoic acid (DHA), an important omega-3 fatty acid, critical for brain and eye health.

“Most people struggle to consume nutritionally balanced diets, and deficiencies, depending on the person and the region, are common in the U.S.,” he said. “By biofortifying eggs, we can offer a practical way to enhance nutrient intake through everyday foods.” 

In another study, Ou collaborated with Kimberly O’Brien, professor of human nutrition, to explore how well people absorbed nutrients from biofortified eggs compared to biofortified chicken or fatty acid supplements. Their research concluded that a single serving of biofortified egg or chicken (with eggs proving more effective) could elevate daily DHA intake to recommended levels, highlighting the potential of biofortified foods to address nutritional deficiencies, Ou said. 

In recognition of his research contributions, Ou was awarded the Leonard A. Maynard Graduate Student Award for outstanding performance in a nutrition-related program. The award honors Maynard, one of Cornell’s most distinguished nutritionists.

I’m excited to explore ways higher education and zoos can collaborate on research projects while mentoring the next generation of scientists.  

Beyond research, Ou is committed to teaching and mentoring undergraduate students. Over the past five years, he has served as a teaching assistant for five different courses and is a Graduate Teaching Lead fellow with Cornell’s Center for Teaching Innovation

Following this passion, Ou looks forward to teaching animal science students at Delaware Valley University after completing his PhD in 2025. “Delaware Valley has a strong zoo science program, and I’ll be working with local zoos to connect students with internship opportunities,” he said. 

“I’m excited to explore ways higher education and zoos can collaborate on research projects while mentoring the next generation of scientists,” he added.   

Caroline Stamm ’24 is a communications assistant for the Cornell CALS Department of Animal Science.

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