TP 7: Studies on the precaecal digestibility of starch and amino acids in horses

For the optimization of diets tailored to meet animal needs, and for maintaining a healthy digestive tract knowledge about the precaecal digestibility of starch and amino acids are required. Because of the very low activity of endogenous amylase in horses, the precaecal digestibility of cereal starch of different origin varies considerably (20 to approx. 100%). Worldwide, the precaecal digestibility of amino acids was determined in horses in only two studies before GrainUp. In this project immediately applicable data about the precaecal digestibility of starch and amino acids from grain lots differing in species, variety and technological treatment were gained in animal trials with caecumfistulated horses. Furthermore, the postprandial glycemic and insulinemic response to the particular feed was determined in vivo. Subsequently, using variance and regression analysis, the relation between the determined in vivo values for precaecal digestibility and the results established in vitro as well as the parameters from chemical analysis (Z-project) of the grain was assessed. With regards to content this subproject is closely linked to the Z-project and the subprojects 1, 2, 3, and 4.

Subproject leader

Prof. Dr. Annette Zeyner

University of Rostock