Under the requirement of reducing and substituting antibiotics, fermented Chinese medicine has been widely used in livestock and poultry breeding because of its nature and no drug residue. To study the impact of Sijunzi powder fermented by Lactobacillus plantarum on the growth performance of broilers, in this study, 75 healthy Ross 308 broilers were selected and randomly divided into 5 groups, each group had 3 replicates,including basic diet group(CK), basic diet+1% of Sijunzi powder group, basic diet+0.5% of Lactobacillus plantarum group, basic diet+0.5% of Lactobacillus plantarum+1% of Sijunzi powder group, and basic diet+1% of fermented Sijunzi powder group. The effects of fermented Sijunzi powder on growth performance of broilers were analyzed by measuring average daily gain, average daily feed intake, feed to gain ratio, contents of crude protein and crude fat in feed and feces, serum biochemical indexes, and digestive enzyme activities in small intestine. The results showed that compared with the control group, the fermented Sijunzi powder significantly decreased the feed to gain ratio(F/G), significantly increased the digestive rate of crude protein and crude fat, and significantly reduced the content of Alanine aminotransferase(ALT) and Aspartate aminotransferase(AST) in serum. There was no significant effect on the content of blood urea nitrogen(BUN) and glucose(GLU) in serum. Fermented Sijunzi powder significantly increased the activity of α-amylase and lipase in the duodenum, as well as the trypsin activity of each small intestinal segment. The above results showed that fermented Sijunzi powder could be used as a feed additive to effectively reduce the feed to gain ratio of broilers, increase the apparent digestibility, enhance the activity of small intestinal digestive enzymes, and improve the growth performance of broilers.
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