Effects Of Dietary Protein Resources On Oligopeptides Release In The Gastrointestinal Tract Of Goat

The experiments were made to sudy the effects of four different dietary protein resources(soybean meal,cottonseed meal,rapeseed meal,and distiller's dried grains with solubles(DDGS)) on the oligopeptides release in the rumen and duodenum of goat fitted with permanent ruminal cannulae and proximal duodenal T-shaped cannulae. Total paper included three chapters presented as follows:In chapter one,the experiment was carried out to study the effects of four different dietary protein resources including soybean meal(A),cottonseed meal(B),rapeseed meal(C) and DDGS(D) on the internal environment parameters of rumen and duodenum in goat alimentary canal Treatments were arranged as a 4×4 Latin square design,and four goats(30±3kg) fitted with permanent ruminal and proximal duodenum cannulaes.The results showed that there were no significant differences(P＞0.05) in rumen pH and concentration of urea nitrogen among the four groups;the average rumen NH₃-N contents of group A was significantly higher than that of group D(P＜0.05). There was significant difference in the yield of MCP among the four groups and the yield of MCP of group A was higher than that of any other groups,it is significantly higher than that of groups B and C(P＜0.05),and most significantly higher than that of group D(P＜0.01).The concentrations of acetic acid,propionate acid,butyric acid and total VFA of groups A and B were were higher than that of groups C and D.There were no significant differences among four groups on the pH,and the concentrations of NH₃-N and Urea-N in duodenum amomg the four groups showed no significant difference(P＞0.05).In chapter two,the experiment was carried out to study the effects of four different dietary protein resources including soybean meal(A),cottonseed meal(B),rapeseed meal(C) and DDGS(D) on the release rules of free and peptide amino acids of rumen and duodenum in goat alimentary canal Treatments were arranged as a 4×4 Latin square design.The results showed that there were significant differences among four groups on the composition and concentrations of free and peptide amino acids.The...