This study aims to evaluate the effects of adding different levels of probiotics to beef cattle diets on their production performance and gut microbiota.In this experiment,72 healthy Simmental hybrid beef cattle with similar weight(320±20)kg were selected and randomly divided into 4 groups,Group Ⅰ,Ⅱ,Ⅲ,and Ⅳ.The results showed that at the end of the experimental period,compared with experimental group Ⅰ,the average daily weight gain and average daily feed intake of experimental groups Ⅱ,Ⅲ,and Ⅳ significantly increased(P<0.05),while there was no significant difference in the feed to meat ratio between the groups(P>0.05);Compared with Experiment Group Ⅰ,the addition of probiotics to Experiment Groups Ⅱ,Ⅲ,and Ⅳ significantly increased the content of lactobacilli in the intestines of beef cattle(P<0.05),while significantly reducing the content of Escherichia coli in the intestines(P<0.05).However,the addition of probiotics did not show significant differences in the content of bifidobacteria and total aerobic bacteria in the intestines(P>0.05).The findings of this study showed that the addition of 2％of probiotic complex fermentation cultures to beef cattle diets significantly improved the performance of beef cattle,including increased daily weight gain and improved feed conversion,and positively regulated the structure of the intestinal flora.
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