The experiment was conducted to research the effect on production,blood indicators and immunity of lactating dairy cows by adding zeolit in diet. Totally 33 lactating cows with similar age, parity, lactation period, milk yield were randomly divided 3 groups that were control group of basal diet and trial groups of basal diet with 90g/d, 150g/d zeolit respectively(3 times everyday). The results showed that: ①milk yield and protein content in group Ⅱ were significantly improved(P<0.05), and the milk fat percentage was significantly increased (P<0.01), the lactose concent was siginificantly reduced by adding zeolit in diet. ②The serum albumin in group Ⅱ was significantly higher than group I(P<0.01) and control group(P<0.05). Total protein content, alkaline phosphatase, aspartate, alanine aminotransferase activity were higher than the group Ⅰ and control group, but the difference was not significant (P>0.05). ③Serum glucose, triglycerides, cholesterol levels of experimental group were lower than the control group, but the difference was not significant (P>0.05). The serum urea nitrogen was significantly decreased (P<0.05) in particular test group Ⅰ (P<0.01). It indicated that the zeolite could improve the immunity of lactating dairy cows, and the adequate supplemental level of zeolite was 150g per cow per day.%选择年龄、胎次、泌乳期、产奶量相近的33头泌乳中期奶牛,随机分为对照组和试验Ⅰ、Ⅱ组,每组11头,对照组饲喂TMR,试验Ⅰ、Ⅱ组在此基础上饲喂沸石粉90g/(头·d)、150g/(头·d).试验结果表明:①与对照组相比,试验Ⅱ组产奶量以及乳蛋白含量显著升高(P<0.05),乳脂率极显著升高(P<0.01),乳糖含量降低(P<0.01).②试验Ⅱ组血清中白蛋白显著高于试验Ⅰ组(P<0.01)及对照组(P<0.05),总蛋白含量和碱性磷酸酶、谷草转氨酶、谷丙转氨酶活性要高于试验I组和对照组,但差异均不显著(P>0.05).③试验Ⅰ、Ⅱ组血清中的葡萄糖、甘油三酯、胆固醇的含量均低于对照组,但差异不显著(P>0.05);与对照组相比,血清中尿素氮含量试验Ⅰ组奶牛极显著降低(P<0.01),试验Ⅱ组显著降低(P<0.05).说明奶牛日粮中添加一定量沸石粉能提高泌乳奶牛的产奶量,不会对奶牛机体造成伤害.本试验表明泌乳中期奶牛日粮中沸石的适宜添加水平为150g/(头·d).
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