柑 橘 提取 物 对 仔猪 盲 肠 微 生物 数 量 和代 谢 产物 的 影 响

This experiment aimed to investigate the effects of citrus extract on the number of microbes and me⁃ tabolites in the cecal content of piglets. One hundred and forty⁃four 28⁃day⁃old Duroc×Landrace×Large White pigs with body weight of (8.39±1.06) kg were randomly assigned to 3 groups with 6 replicates per group and 8 pigs per pen (4 boars, 4 females). Piglets in the control group were fed a basal diet, piglets in the antibiotic group were fed the basal diet supplemented with 75 g / t chlortetracycline, and piglets in the citrus extract group were fed the basal diet supplemented with 300 mL / t citrus extract. The experiment lasted for 28 d. The results showed as follows: 1) compared with control group, dietary citrus extract significantly increased the number of lactic acid bacteria in cecal content of piglets (P<0.05), while antibiotic significantly decreased the number of lactic acid bacteria (P<0.05). Compared with control group, dietary citrus extract and antibiotic significantly decreased the number of Escherichia coli in cecal content of piglets (P<0.05), and the number of Escherichia coli in citrus extract group was significantly lower than that in antibiotic group (P<0.05). 2) Compared with control and antibiotic groups, dietary citrus extract significantly increased the contents of taurine, threonine, serine, valine, leucine and lysine in cecal content of piglets (P<0.05). Compared with control group, dietary citrus extract significantly decreased the contents of aspartic acid, isoleucine, cystathionine, hydroxylysine, or⁃ nithine, proline and total amino acids in cecal content of piglets (P<0.05) and tended to decrease the contents of glutamate and alanine (0.05≤P<0.10), and dietary antibiotic significantly decreased the content of orni⁃ thine and proline (P<0.05). 3) Compared with control group, dietary citrus extract significantly decreased the contents of phenol and skatole (P<0.05). Compared with control and antibiotic groups, dietary citrus extract significantly decreased the content of putrescine (P<0.05) and tended to decrease the contents of tyramine and spermine in cecal content of piglets (0.05≤P<0.10). Compared with control group, dietary citrus extract and antibiotic significantly decreased the contents of methylamine in cecal content of piglets (P<0.05). In conclu⁃ sion, citrus extract increases the number of lactic acid bacteria in cecal content of piglets, and decreases the contents of metabolites and the number of Escherichia coli.