Digestive Capacity in Weanling and Mature Horses Studied

Researchers compared the digestibility of a high-forage diet when fed to weanling versus mature horses.
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Equine researchers have evaluated common horse feeds’ digestibility (the percentage of the digestion and absorption of various nutrients present in a feed source) primarily in mature horses, but little is known about the digestive capacity of young, growing horses.

Previous research suggests mature and young horses utilize high-fiber diets differently than adults, mainly because younger horses have a shorter retention time in the large intestine. A team of University of Kentucky (UK) researchers recently set out to compare the digestibility of a high-forage diet when fed to weanling versus mature horses.

The research team paired six weanling colts with six mature geldings (with an average age of 13.2 years) and allowed them to adapt for 21 days to a diet comprosed of 67% alfalfa cubes and 33% commercial concentrate.

On Day 1 of the study’s five-day collection period, Laurie Lawrence, PhD, professor of equine nutrition at the University of Kentucky, and colleagues fed each pair the same amount of two indigestible markers used to measure the average period of feed retention in the digestive tract (also called the mean retention time, or MRT)—called Co-EDTA and Yb—mixed with molasses and a portion of their concentrate for palatability

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Kristen M. Janicki, a lifelong horsewoman, was born and raised in the suburbs of Chicago. She received her Bachelor of Science degree in Animal Sciences from the University of Illinois at Urbana-Champaign and later attended graduate school at the University of Kentucky, studying under Dr. Laurie Lawrence in the area of Equine Nutrition. Kristen has been a performance horse nutritionist for an industry feed manufacturer for more than a decade. Her job entails evaluating and improving the performance of the sport horse through proper nutrition.

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