Effects of different microecological preparations added to diets on performance of fattening cattle
The purpose of the experiment was to study the effect of adding microecological preparations to diet on the performance of fattening cattle.Thirty-six cattle were randomly divided into three groups(the control group,Bacillus subtilis group,and Bacillus licheniformis group).Each group had three replicates,and each replicate had four fattening cattle.The three experimental groups were fed basal diet,basal diet plus 7 g/(cattle·d)of Bacillus subtilis and basal diet plus 7 g/(cattle·d)of Bacillus licheniformis respectively.The trial period was 30 days.The results showed that compared with the control group,the average daily gain of fattening cattle in the Bacillus licheniformis group increased by 29.0%,while that in Bacillus subtilis group decreased by 12.9%,but the difference was not significant(P>0.05).Compared with the control group,the average daily feed intake and feed-to-gain ratio of fattening cattle between the Bacillus licheniformis group and Bacillus subtilis group were not significantly different(P>0.05),but the feed-to-gain ratio of the Bacillus licheniformis group was significantly lower than that of the Bacillus subtilis group(P<0.05).In the middle and later stages of the experiment,compared with the control group,the proportion of materials on the upper layer of fecal screen in the Bacillus licheniformis group decreased,while the proportion of materials on the upper layer of fecal screen in the Bacillus subtilis group was similar to that in the control group.The results showed that adding Bacillus licheniformis to the diet could increase the feed intake and daily gain of fattening cattle,and improve the digestibility of fattening cattle to the diet.Under the same experimental conditions,the effect of adding Bacillus subtilis is not obvious.
Fattening cattleBacillus subtilisBacillus licheniformisProduction performanceFecal sieve test
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