Effects of Lactobacillus brevis Supplementation on Growth Performance, Serum Biochemical Indices of Growing Pigs

To evaluate the effects of Lactobacillus brevis on growth performance and serum biochemical indices of growing pigs,a total of 108 Duroc×Landrace×Yorkshire crossbred growing pigs aged(70±2) days with an average body weight of(24.49±1.61) kg were divided into 3 groups with 3 replicates per group and 12 pigs per replicate according to the principle of the same sex,body weight and litter.The pigs in the 3 groups were fed a basal diet(control group),the basal diet+0.05% Lactobacillus brevis(group Ⅰ) and the basal diet+0.10% Lactobacillus brevis(group Ⅱ).The trial lasted for 30 days.The results showed as follows: 1) compared with the control group,average daily feed intake(ADFI) and the ratio of feed to gain in group Ⅰ were significantly decreased(P0.05),and the ratio of feed to gain in group Ⅱ was significantly decreased(P0.01);2) compared with the control group,there was a decrease in the number of E.coli(P0.05) and a increase in the number of Lactobacillus in the fecal samples of growing pigs in group Ⅱ(P0.05);3) compared with the control group,serum albumin content in groups Ⅰ and Ⅱ were significantly decreased(P0.05 and P0.01,respectively),serum globulin content was significantly increased(P0.01),serum albumin/globulin was significantly decreased(P0.01),serum haptoglobin content was significantly decreased(P0.01),and serum interferon-γ(IFN-γ) content was significantly increased(P0.05).The results show that Lactobacillus brevis can significantly improve the balance of the intestinal microecosystem,immunity and growth performance of growing pigs.