Effects of dietary bacterial enzyme preparation on growth performance,intestinal flora,and nutrient apparent digestibility of calves
The experiment aimed to study the effects of different levels of bacterial enzyme preparation on the growth performance,intestinal flora,and nutrient apparent digestibility of calves.A total of 36 Holstein calves with similar body weights were randomly divided into four groups,with nine replicates per group,with one calve in each replicate.The control group was fed a basic diet,while the experimental groups were fed diets supplemented with 0.1％,0.2％,and 0.4％bacterial enzyme preparation.The trial period was 30 days.The results showed that compared with the control group,the final weight and average daily weight gain of the 0.2％and 0.4％bacterial enzyme preparation groups were significantly increased(P＜0.05),and the feed to gain ratio was significantly reduced(P＜0.05).The diarrhea rate of all bacterial enzyme preparation groups was significantly reduced(P＜0.05).The number of lactic acid bacteria in the intestines of calves in all bacterial enzyme preparation groups was significantly increased(P＜0.05),while the number of Escherichia coli and Salmonella was significantly reduced(P＜0.05).The total aerobic bacteria count in the intestines of calves in the 0.2％and 0.4％bacterial enzyme preparation groups was significantly decreased(P＜0.05).The apparent digestibility of organic matter and dry matter in the 0.2％and 0.4％bacterial enzyme preparation groups was significantly improved(P＜0.05),and the apparent digestibility of crude protein,neutral detergent fiber,and acid detergent fiber in all bacterial enzyme preparation groups was significantly enhanced(P＜0.05).The study indicates that the addition of an appropriate amount of bacterial enzyme preparation can improve the intestinal flora structure and the body's absorption and digestion of nutrients in the feed,thereby improving growth performance.The suitable addition level of bacterial enzyme preparation is 0.2％.
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