Effect of soybean active peptides on growth performance, carcass traits, serum biochemical indexes and intestinal microorganisms in finishing pigs.

The purpose of the paper was to explore the effect of adding different levels of soybean active peptides to the diet on the growth performance, carcass traits, serum biochemical indexes and intestinal microorganisms of finishing pigs. A total of 120 finishing pigs with a weight of (72.40±1.10) kg were randomly divided into four groups, with three replicates in each group and 10 pigs in each replicate. The finishing pigs in the control group were fed a basic diet, and group A, group B and group C added 0.2%, 0.4% and 0.6% soybean active peptides in the basic diet, respectively. The experiment lasted for 42 days. The results showed that the average daily gain of the finishing pigs was significantly increased by adding soybean active peptide (P<0.05). Compared with the control group, the feed-to-weight ratio of the group B was significantly reduced (P<0.05), and the feed-to-weight ratio and average back fat thickness of the group C were significantly reduced ( P<0.05). Adding soybean active peptide could improve the meat color and significantly reduce the dripping loss of the finishing pigs in the group B and group C (P<0.05). Compared with the control group, the content of serum MDA in the experimental groups decreased significantly (P<0.05), the content of serum BUN in the group B and group C decreased significantly (P<0.05), the content of IgM and T-AOC increased significantly (P<0.05). The activity of serum AST and GSH-Px in the group C decreased significantly, and the content of IgG increased significantly (P<0.05). The flora with a relative abundance of more than 1% at the phylum level in each experimental group included Firmicutes, Proteobacterium and Bacteroides, and the relative abundance of Proteobacterium in the group C was significantly lower than that in the control group (P<0.05). The flora with a relative abundance over 1% at the genus level included Actinomycetes, Coprococcus, Clostridium and Enterobacter, and there was no significant difference in the relative abundance of each genus compared with the control group (P>0.05). The study indicates that adding 0.4%~0.6% soybean active peptide to the diet can improve the growth performance, modify carcass traits, adjust serum biochemical indexes, and affect the intestinal microbial composition of finishing pigs. [ABSTRACT FROM AUTHOR]