Effect of Phytase Supplementation On Protein Digestibility in Horses At Maintenance
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Authors
Zingsheim, Justine
Issue Date
2009
Type
Thesis
Language
en_US
Keywords
Alternative Title
Abstract
Protein digestibility in horses has been researched for years. Despite established
requirements, the feeding of too much protein has become a major environmental
concern for its role in excess nitrogen emissions. Recent studies have looked to improve protein digestibility in horses so as to reduce the amount of nitrogen released into the
environment. The enzyme phytase has been extensively studied for its effects on
improving the digestibility of phosphorus, but little has been done to observe its effects
on protein digestibility. Phytate, the form in which plant phosphorus is found, has been
observed developing complexes with amino acids and proteins. Because phytase has been
found to improve the digestibility of phosphorous in this form, it could also improve
protein availability. Six mature Arabian geldings were used in a 6 x 6 Latin square design
to study protein digestibility during phytase supplementation. Horses were fed one of six
rotating diets for a I4-day period. Each I4-day period consisted of an II-day adaptation
period followed by a 3-day total collection. Throughout the study, each horse received all
six diets without repeating. Body weights for each horse declined over the duration of the
study resulting in a decrease in the amount of concentrate, hay, and nitrogen consumed
each day. Nitrogen content of both feces and urine did not differ by diet nor did nitrogen
output. Apparent nitrogen digestibility did vary by diet. This, however, was only due to
the large hay content of diets five and six. No affect of phytase supplementation on
protein digestibility in horses was found, as there was no illustrated effect on apparent
digestibility by the addition of phytase into the horses' diets.
Description
v, 23 p.
Citation
Publisher
Kalamazoo College
License
U.S. copyright laws protect this material. Commercial use or distribution of this material is not permitted without prior written permission of the copyright holder.