不同月龄苏淮育肥猪纤维表观消化率、肠道长度 与微生物差异分析.

[Objectives]The experiment of this study was conducted to investigate the characteristics of fiber tolerance(assessed by apparent fiber digestibility), intestinal development and intestinal microorganism of Suhuai finishing pigs of different months of age, and to analyze the correlation between intestinal development, fiber apparent digestibility and intestinal microorganism. [Methods]Eighty-two Suhuai finishing pigs with similar birth conditions were selected and raised in the same feeding environment. The pigs were slaughtered at 7 or 8 months of age, and the contents of posterior colon samples were collected to determine the apparent digestibility of various nutrients in posterior colon segment at different months of age. The intestinal length and circumference were measured to analyze the intestinal development differences of Suhuai finishing pigs at different months of age. The correlations between apparent digestibility and intestinal length and circumference were also analyzed. And according to the apparent digestibility of fiber in the posterior segment of colon, 5 pigs in the high fiber digestibility group and 5 pigs in the low fiber digestibility group were selected at 7 and 8 months of age to analyze the abundance of common fibrolytic bacteria in the cecum and colon contents. [Results]The apparent digestibility of crude fiber(CF), neutral detergent fiber(NDF), acid detergent fiber(ADF), crude protein(CP)and ether extract(EE)of 8 months Suhuai pigs were significantly higher than those of 7 months Suhuai pigs(P<0.05). There was no significant difference in the length of large intestine, small intestine and whole intestine, cecum and colon circumference between Suhuai pigs at 7 and 8 months of age. There was a significant positive correlation between cecum circumference and apparent digestibility of CF, ADF and EE(P<0.05). There was no significant difference in the abundance of Ruminococcus albus and Clostridium leptum in cecum and colon of Suhuai pigs at 7 and 8 months of age between high and low fiber digestibility groups. The abundance of Clostridium leptum in colon of Suhuai pigs aged 7 months was significantly higher than that in cecum in both high and low fiber digestibility groups(P<0.05). The abundance of Clostridium leptum in colon of 8-month-old Suhuai pigs in low fiber digestibility group was significantly lower than that of 7-month-old Suhuai pigs(P<0.05). [Conclusions]Different months age of Suhuai pigs had different characteristics of fiber tolerance. The digestive performance of Suhuai pigs improved with age, the nutrients apparent digestibility of Suhuai pigs aged 8 months was significantly higher than that of 7 months of age, and the fiber digestibility of Suhuai pigs was significantly positively correlated with cecum circumference. But the Ruminococcus albus and Clostridium leptum in intestinal contents might not be the key microorganisms affecting the fiber digestion of Suhuai pig. [ABSTRACT FROM AUTHOR]