Effects of Dietary Bacillus licheniformis and Clostridium butyricum on Growth,Digestion and Serum Biochemical Indexes in Fattening Lambs
[Objective]Digestive dysfunction caused by high-concentration feeding in fattening lambs has been paid more attention in recent years.The objective of present study was to investigate the effects of two probiotics(Bacillus licheniformis and Clostridium butyricum)added alone or in combination in diet on growth performance,nutrient apparent digestibility and serum biochemical indexes of fattening lambs.[Method]One hundred and twenty-five 3-4 months fattening lambs with body weight at 30.89 kg±0.38 kg were randomly allocated into five groups including control group,antibiotic group(20 mg/kg monensin)and three probiotic groups(Bacillus licheniformis 4 × 1010 CFU/kg,Clostridium butyricum 2 ×108 CFU/kg,and Bacillus licheniformis 4× 1010CFU/kg+Clostridiuw butyricum 2×108 CFU/kg).The experiment lasted for 60 days including the early stage(1-30 d)and late stage(31-60 d).Growth performance and nutrient apparent digestibility in lambs were measured for two experimental stages.Serum biochemical parameters in lambs were measured on 1 st,30th and 60th day of the experiment.[Result]There was no difference in average daily feed intake among all groups(P＞0.05).However,throughout the entire experimental period,compared with the control group the combination of two probiotics significantly increased average daily gain(P＜0.05),and feed/gain ratio(F/G)of three probiotic groups were all decreased.Moreover,in the late period,the F/G in the combined group was significantly lower than that in other two groups(P＜0.05).Additionally,the combination group exhibited a significant increase in apparent digestibility of dry matter during both early and late periods(P＜0.05).In the early period,all three probiotic groups showed a significant improvement in acid detergent fiber digestibility compared with control group(P＜0.05).Furthermore,serum glucose concentrations in three treatment groups increased by 16.97％to 28.18％during the late period when compared with control group(P＜0.05).[Conclusion]The dietary supplementation of Bacillus licheniformis and Clostridium butyricum alone or in combination could improve growth and digestive performance of lambs,and the effect of combined supplement was optimal.
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