[目的]为探究益生菌对断奶后犊牛采食量、增重、胴体率和血液指标的影响。[方法]本试验选取了16 头（60±5）日龄荷斯坦奶公犊,随机分成4 组,分别为CK组（基础日粮+0%益生菌）、处理1组（基础日粮+1%益生菌）、处理2组（基础日粮+2%益生菌）、处理3组（基础日粮+3%益生菌）,预试期3 d,正式饲喂42 d。[结果]与CK组相比,处理1组、处理2组、处理3组的平均日采食量分别提高了6.05%、7.44%、7.91%（P>0.05）,平均日增重分别提高了7.11%、21.84%、21.24%（P<0.05）,胴体率分别提高了6.78%、9.75%、8.47%（P<0.05）,处理1组和CK组料重比差异不显著（P>0.05）,而处理2组、处理3组与CK组相比,料重比分别显著下降了11.84%和10.90%（P<0.05）,不同益生菌处理的断奶公犊牛血清中总蛋白、白蛋白、球蛋白含量均呈显著增加趋势（P<0.05）,但尿素氮、肌酐和尿酸指标差异不显著（P>0.05）。[结论]在断奶后公犊牛日粮中添加适量的益生菌,可以促进犊牛体重增加,刺激采食,提高免疫力,综合各个指标和饲喂成本,适宜的益生菌添加量为2%。
[Objective] To explore the effects of probiotics on feed intake,weight gain,carcass rate and blood indexes of weaned calves. [Methods] Sixteen （60±5）day old Holstein calves were randomly divided into four groups CK group （basic diet +0% probiotics）,treatment group 1 （basic diet +1% probiotics）,treatment group 2 （basic diet +2% probiotics）,treatment group 3 （basic diet +3% probiotics）. The pre-trial period was 3 days,and the formal feeding was 42 days. [Results] Compared with CK group,the average daily feed intake of treatment group 1, treatment group 2 and treatment group 3 increased by 6.05%,7.44% and 7.91% respectively （P> 0.05）,the average daily gain increased by 7.11%,21.84% and 21.24% respectively （P< 0.05）, and the carcass rate increased by 6.78%,9.75% and 8.47% respectively （P< 0.05）. There was no significant difference in feed weight ratio between treatment group 1 and CK group （P> 0.05）, while treatment group 2 and treatment group 3 compared with CK group,The feed to weight ratio decreased significantly by 11.84% and 10.90% respectively（P< 0.05）.The contents of total protein,albumin and globulin in serum of weaned calves treated with different probiotics showed a significant increase trend （P < 0.05）,but there was no significant difference in urea nitrogen, creatinine and uric acid indexes （P> 0.05）. [Conclusion] Adding an appropriate amount of probiotics to the diet of weaned calves can promote the weight gain of calves,stimulate feeding, improve immunity,and integrate various indicators and feeding costs. The appropriate amount of probiotics is 2%.
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