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• W1505318886 abstract "OF DISSERTATION Jennifer Elizabeth Earing The Graduate School University of Kentucky 2011 COMPARISON OF DIGESTIVE FUNCTION IN YOUNG AND MATURE HORSES _________________________ ABSTRACT OF DISSERTATION _________________________OF DISSERTATION _________________________ A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the College of Agriculture at the University of Kentucky By Jennifer Elizabeth Earing Lexington, Kentucky Director: Dr. Laurie M. Lawrence, Professor of Animal Science Lexington, Kentucky 2011 Copyright © Jennifer Elizabeth Earing 2011 ABSTRACT OF DISSERTATIONOF DISSERTATION COMPARISON OF DIGESTIVE FUNCTION IN YOUNG AND MATURE HORSES While forage plays an important role in equine nutrition, little research has been conducted evaluating fiber utilization by young horses. Therefore, studies were conducted to compare in vivo digestibility and digesta passage in weanlings and mature horses (Exp 1) and yearlings and mature horses (Exp 2). All horses were fed foragebased diets at the same rate (on a metabolic BW basis; Exp1: 67% alfalfa cubes, 33% concentrate; Exp 2: 75% timothy cubes, 25% concentrate). Ytterbium labled hay and cobalt-ethylenediaminetetraacetic acid were used to estimate digesta mean retention time (MRT), while in vivo digestibility (DM, OM, and NDF) was measured using a total fecal collection method. Feed and water intake was similar between young and mature horses in both experiments. In Exp 1, there were no differences in digestibility or MRT due to age. The results suggested that weanling horses are capable of digesting a relatively high quality diet as efficiently as mature horses and that most of the development of the gastrointestinal tract occurs before 6 mo of age. In Exp 2, digestibility estimates were greater (P < 0.0311) for the yearlings than for the geldings. The increased digestive capacity of the yearlings was likely due to the longer MRT observed for the particulate phase in the yearlings (P = 0.0190). A third study was conducted to compare the microbial profiles of the feces of mares and foals. Fecal samples were collected from mare-foal pairs as the foal matured. The profiles of each pair, obtained using polymerase chain reaction-denaturing gradient gel electrophoresis, were compared and used to describe bacterial colonization in the foal. Mean similarity between mares and their foals on the day of parturition was low, but rapidly increased. Within 2 wk of parturition, similarity among mares and their foals was higher than among mature mares, suggesting that by 2 wk of age the bacterial species found in the foals’ gut are similar to those found in the mature horse. Collectively, the results from this series of experiments describe the early development of the foal’s digestive capacity." @default.
• W1505318886 created "2016-06-24" @default.
• W1505318886 creator A5066481125 @default.
• W1505318886 date "2011-01-01" @default.
• W1505318886 modified "2023-09-23" @default.
• W1505318886 title "Comparison of digestive function in young and mature horses" @default.
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