| This paper mainly studied the effects of different protein sources(soybean meal, cottonseed meal, rapeseed meal and DDGS) on several nutritional indices, amino acid and small peptides in the rumen and small intestine of goat by proximal duodenal T-shaped cannulae technique, and the absorption of the rumen left vein and mesenteric-drained viscera(MDV) by venous cateher technique in the different times.A serial of experiments in this article were conducted to investigate the dynamic changing rules of internal environment parameters in the rumen and duodenum, and the metabolize of amino acid and small peptides, some blood biochemical indices and the absorption of the rumen left vein and MDV.Chapter 1 Effects of different Protein Sources on internal environment parameters in the rumen and duodenum1. In the rumen, pH were 6.30,6.44,6.35 and 6.45 in soybean meal, cottonseed meal, rapeseed meal and DDGS group respectively. pH in soybean meal group was lower than that in DDGS group significantly (P<0.05). pH decreased significantly after feed, and reached the lowest point 4h after feed. In the duodenum, pH were 2.43,2.40,2.09 and 2.25 respectively, soybean meal and cottonseed meal group were higher than rapeseed meal and DDGS group significantly (P<0.05).2. In the rumen, NH3-N concentration in soybean meal group was higher than that in rapeseed meal (P<0.01) and DDGS(P<0.05), cottonseed meal was higher than rapeseed meal and DDGS(P<0.01), and they all increased after feed, then decreased, but reached the highest point at different time. In the duodenum, NH3-N concentration in soybean meal and cottonseed meal group was higher than that in rapeseed meal and DDGS significantly (P<0.05). NH3-N concentration in soybean meal and cottonseed meal group increased after feed, then decreased, rapeseed meal and DDGS kept steadily after feed, then increased slowly 1h after feed.3. In the rumen, the acetate, propionate and butyrate concentration was highest in...
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