日粮粗蛋白质水平对杜寒杂交断奶羔羊生长性能、血清生化及免疫指标的影响

Abstract

Abstract: This experiment was conducted to study the effects of crude protein levels of starters on growth performance, serum biochemical and immune indexes of weaning lambs.Eighteen Dorper × Thin-tailed Han F1 lambs were randomly divided into three groups.Each group had 6 lambs, half rams and half ewes.Groups A, B and C were fed with three kinds of pelleted rations, respectively.They contained similar metabolizable energy, but the crude protein levels were different (10.40%, 13.00% and 15.70%).The body weight, withers height, body length, heart girth were measured and serum was collected before morning feeding on 0, 30 and 60 days of trial begins.The results showed that the lamb were fed with ration contained 13.00% crude protein, average daily gain was 248.67 g, higher than the other groups.The wither height, body length and heart girth among the three groups had no significant differences (P>0.05).Three groups had no significant differences in the serum concentration of GLU, TP, ALB, GLB, TCHO and ALB/GLB (P>0.05).The rations curde protein levels had significant effect on the serum concentration of BUN and TG (P<0.05).The serum IL-2 concentration of group B was significantly higher than that of A and C groups at 150 days of age (P<0.05), and the serum TNF-α concentration of group B was significantly higher than that of A and C groups at 180 days of age (P<0.05), the serum IgA of group B was significantly higher than that of group A at 180 days of age (P<0.05).In conclusion, the ration contained 13.00% of crude protein met the requirement of the optimum immune state and growth performance of Dorper × Thin-tailed Han crossbred lambs.

Key words: lambs; crude protein; growth performance; serum biochemical indexes; immune indexes

CLC Number:

S826

SI Bing-wen, SHEN Yan, DENG Kai-dong, ZHANG Nai-feng, JIANG Cheng-gang, LOU Can, CHEN Dan-dan, SUN Wei-li, DIAO Qi-yu, TU Yan. Effects of Crude Protein Levels on Growth Performance,Serum Biochemical and Immune Indexes in Dorper × Thin-tailed Han Crossbred Weaning Lambs[J]. , 2014, 41(12): 131-137.

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Effects of Crude Protein Levels on Growth Performance,Serum Biochemical and Immune Indexes in Dorper × Thin-tailed Han Crossbred Weaning Lambs

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