Effects of Lactobacillus paracasei-Fermented Feed on Growth Performance, Fecal Bacteria Populations and Volatile Fatty Acid Contents, and Serum Biochemical and Immune Indexes of Growing Pigs
LIU Hui, JI Haifeng, WANG Sixin, ZHANG Dongyan, WANG Jing, ZHANG Wei, WANG Yamin
Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Abstract:This experiment was conducted to evaluate the effects of Lactobacillus paracasei-fermented feed on growth performance, fecal bacteria populations and volatile fatty acid contents, and serum biochemical and immune indexes of growing pigs. A total of 140 Landrace×Yorkshire crossbred growing pigs with an average body weight of (20.86±0.62) kg were divided into 2 groups:control group and experimental group. Each group had 5 replicates with 14 pigs per replicate. Pigs in the control group were fed a basal diet, and pigs in experimental group were fed an experimental diet which consisted of basal diet (95%) and Lactobacillus paracasei-fermented feed (5%). The pre-experimental period was 5 days, and the experimental period was 31 days. The results showed that, compared with the control group:1) the final weight and average daily gain were increased by 6.32% (P<0.05) and 12.23% (P<0.05), respectively, and the feed/gain was decreased by 8.58% (P<0.05) in the experimental group; 2) the population of fecal lactic acid bacteria was significantly increased (P<0.05), and the populations of Escherichia coli and Staphylococcus aureus were significantly decreased (P<0.05) in the experimental group; 3) the contents of acetic acid, butyric acid and total volatile fatty acid in feces in the experimental group were increased by 13.44% (P<0.05), 20.51% (P<0.05) and 11.01% (P<0.05), respectively; 4) the contents of serum total protein, globulin, immunoglobulin G and immunoglobulin A were increased by 18.85% (P<0.05), 33.31% (P<0.05), 15.85% (P<0.05) and 45.86% (P<0.05), and the contents of serum urea nitrogen and haptoglobin were decreased by 19.29% (P<0.05) and 52.72% (P<0.05) in the experimental group, respectively. The results indicate that Lactobacillus paracasei-fermented feed can improve the growth performance, regulate the intestinal microbial balance, enhance the immune function and increase the contents of volatile fatty acids in feces of growing pigs.
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LIU Hui, JI Haifeng, WANG Sixin, ZHANG Dongyan, WANG Jing, ZHANG Wei, WANG Yamin. Effects of Lactobacillus paracasei-Fermented Feed on Growth Performance, Fecal Bacteria Populations and Volatile Fatty Acid Contents, and Serum Biochemical and Immune Indexes of Growing Pigs. Chinese Journal of Animal Nutrition, 2019, 31(8): 3747-3754.
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