不同锌水平对荷斯坦种公牛血液理化指标的影响

本文旨在研究不同水平的锌对荷斯坦种公牛血液理化指标的影响。试验选取30头荷斯坦种公牛,随机分为5组,单因子饲养试验设计,分别饲喂不同锌水平的日粮,A为对照组,饲喂基础日粮,B、C、D、E组锌的添加水平分别为50、80、110和200 mg/kg(按日粮干物质计),试验期为8个月。结果表明:(1)不同锌水平对荷斯坦种公牛血清中谷草转氨酶(GOT)和谷丙转氨酶(GPT)酶活性影响极显著(P<0.01),对碱性磷酸酶(AKP)和乳酸脱氢酶(LDH)活性无显著影响(P>0.05);(2)不同锌水平对荷斯坦种公牛血清中睾酮含量影响极显著(P<0.01),对血清锌影响不显著(P>0.0 5)。综合分析不同锌水平试验牛生理生化指标的变化得出,锌的适宜添加量为1 1 0 mg/kg日粮干物质。

Effect of Different Levels of Zinc on Blood Physiological and Biochemical Parameters in Stud Holstein Bulls

Thirty breeding Holstein bulls assigned randomly to five groups was conducted to study the effect of different levels of zinc on blood physiological and biochemical parameters.This experiment involved 5 dietary treatments with single factorial arrangement,consisting of one control group fed basal diet and four levels of zinc which is 50,80,110 and 200 mg/kg(by the dry matter of the dietary).The results showed that 1) the effect of different levels of zinc on the activity of GPT,GOT were extremely significant(P<0.01),but that on AKP,LDH were not significant(P>0.05);2) the effect of different levels of zinc on the testosterone contents in serum were extremely significant(P<0.01),but that on zinc contents in serum was not significant(P>0.05).All of the variety of physiological and biochemical parameters analysed in each group indicated that the optimal supplementation of zinc was 110 mg/kg by the dry matter in this experiment.