复合益生菌对肉鸡 生长性能、免疫性能及肠道微生物的影响.

The experiment was conducted to investigate the effect of different content of compound probiotics on growth performance, immune performance, intestinal microbiome and intestinal morphology of AA broilers. A total of 1 440 one-day-old broilers (half in male and female) with similar body weight were randomly divided into four groups with six replicates in each group and 60 broilers in each replicate. Broilers in control group were fed with basic diet (CON group), and the experimental groups were supplemented with 500 (CP1 group), 1 000 (CP2 group) and 2 000 g/t complex probiotics (CP3 group), respectively. The experiment lasted for 42 d. The results showed that during the whole experiment period, the average daily gain of broilers in CP2 group and CP3 group was extremely higher than that of CP1 group and CON group (P<0.01), and feed to gain ratio was extremely lower than that of CON group (P<0.01). The spleen index, thymus index and bursa of Fabricius index of broilers in CP3 group were extremely higher than those in CON group (P<0.01), and the serum IgA and IgM content of broilers in CP3 group were extremely higher than those in CON group (P<0.01). The number of E. coli in cecum in CP3 group was extremely lower than that in CON group (P<0.01), and the number of Lactobacillus in cecum was significantly higher than that in CON group (P<0.01). The villus height and pile to hide ratio of small intestine of broilers in CP3 group were significantly (P<0.05) or extremely (P<0.01) higher than those in CON group. The study indicates that dietary supplementation of complex probiotics can effectively improve the growth performance, immune performance, intestinal microbial abundance and intestinal villus height of broilers, and the better effect is when the supplemental level is 2 000 g/t. [ABSTRACT FROM AUTHOR]