| The manipulation of rumen fermentation , antioxidation and immune function in cashmere goats by adding yeast culture was studied in this thesis. Twelve mature half-sib Inner Mongolia White Cashmere wether goats with permanent ruminal and proximal duodenum cannulas were divided into four groups using self-contrast designs and fed on 1.2M basal diets which had concentrate/roughage ratio of 3:7(A1, A3) and 2:8(B1,B2) respectively in control trials. Yeast culture (YC) which additional levels were selected in vitro were supplemented with A1 and B1: 2.0%, A3: 3.0%, B2: 2.5% respectively in YC supplement trials. The results obtained showed that:1. Rumen environments and acetate/propionate ratios were not affected, but the rumen NH3-N concentrations of the animals given A3 and B1 treatments were decreased significantly (P<0.01), rumen total VFA concentration was increased significantly (P<0.01) and rumen BCP concentrations tended to increase after supplementing YC .YC supplement tended to increase the flow of digesta, N and non ammonia nitrogen (NAN) in the duodenum(P>0.05), and higher level of YC supplement increased the flow of microbial nitrogen (MN) in the rumen and the duodenum. The percentage of Lys and Arg in the profiles of duodenal digesta AA, and the flow of Lys in A1, Thr, His, Tyr, Phe and Glu in A3 treatment were increased significantly (P<0.05), the flow of other AA and AABI in all treatments tended to increase by yeast culture supplementation.Dry matter intake and N intake (A1, A3: P<0.05) were greater, and dietary digestible N and N retention tended to be higher for the cashmere goats supplemented with yeast culture. YC supplement tended to decrease PUN, serum GOT, GPT concentrations, but increased plasmatic total protein, AKP (P>0.05) and albumin concentration (P<0.05).2. YC supplement increased the quantities of rumen bacterial in A3, B1 (P<0.05), B2 treatments, and increased the quantities of rumen fungi (A3:...
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