Effects of Active Dry Yeast on Growth Performance,Slaughter Performance and Serum Biochemical Indexes of Jinlan Cashmere Goats
[Objective]This study was aimed to explore the effects of active dry yeast on growth performance,slaughtering performance and serum biochemical,immune and antioxidant indexes of Jinlan cashmere goats,and select the appropriate amount of active dry yeast.[Method]A total of 100 3-month-old Jinlan cashmere male lambs were randomly divided into 5 groups,with 20 lambs in each group and 4 lambs in each replicate.Goats in experimental groups ADY1,ADY2,ADY3 and ADY4 were fed with 1,2,3 and 4 g/d active dry yeast on the basis of the basal diet,respectively,while goats in control group(ADY0)was not added active dry yeast.The growth performance and serum biochemical,immune and antioxidant indexes were measured every 30 days,and the slaughter performance was measured on days 90 after the initial experiment for 15 days and the formal experiment for 90 days.[Result]Compared with control group,① The final body weight of goats in ADY3 and ADY4 groups was significantly increased(P＜0.05),and the feed to gain was significantly decreased(P＜0.05).On days 90,the chest circumference and body length of goats in ADY3 group were significantly increased(P＜0.05),and the chest circumference of goats in ADY4 group was significantly increased(P＜0.05).② The live weight before slaughter,carcass weight and eye muscle area of goats in ADY3 and ADY4 groups were significantly increased(P＜0.05),while the carcass fat content and backfat thickness were significantly decreased(P＜0.05).The net meat weight and net meat percentage of goats in ADY2,ADY3 and ADY4 groups were significantly increased(P＜0.05),and the heart weight of goats in ADY3 and ADY4 groups was significantly increased(P＜0.05).③ On days 30,60 and 90,the serum triglyceride(TG)content of goats in 4 experimental groups was significantly increased(P＜0.05),and the total cholesterol(TC)content of goats in ADY3 group was significantly decreased(P＜0.05).On days 90,the contents of total protein(TP)and globulin(GLB)of goats in ADY2 and ADY3 groups were significantly increased(P＜0.05).④ On days 60 and 90,the contents of immunoglobulin A(IgA)and tumor necrosis factor-α(TNF-α)in ADY3 group were significantly increased(P＜0.05).⑤ On days 60,the total antioxidant capacity(T-AOC)and superoxide dismutase(SOD)activity of goats in ADY3 group were significantly increased(P＜0.05).On days 60 and 90,the malondialdehyde(MDA)content of goats in ADY3 group was significantly decreased(P＜0.05).⑥ On days 90,the serum insulin growth factor-1(IGF-1)content of goats in ADY2 and ADY3 groups was significantly increased(P＜0.05).[Conclusion]Adding an appropriate amount of active dry yeast to the feed could improve the growth performance and slaughtering performance of Jinlan cashmere goats,enhance immunity and antioxidant capacity.Considering the comprehensive indicators,the appropriate adding amount was 2-3 g/d.
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