早期断奶对羔羊器官发育和营养物质代谢的影响.

This study aims to study the effects of early weaning on the organ development and apparent digestibility of nutrients in lambs. A total of 36 crossbred healthy lambs (half male and half female) with a similar weight (9.5±1.2) kg and age (25.0±1.5) d were selected for rearing experiments, and randomly divided into 3 groups, namely control group, group Ⅰ, and group Ⅱ, each group of 12 sheep, divided into 3 replicates. The control group naturally lactated, group Ⅰ and Ⅱ group were fed milk substitutes A and B respectively. The lambs in the experimental group were pre-weaned at 25 days of age and completely weaned at 30 days of age, and fed with milk substitutes. At 90 days of age, two healthy lambs with a weight close to the average weight were selected for each replicate, and one was slaughtered and one was digested. The results showed that the difference in slaughter rate between the experimental group and the control group was not significant (P>0.05). Rumen, wrinkled stomach, small intestine fresh weight, lung, pancreas, spleen weight of control group were lower than experimental group, and the differences between group Ⅰ and control group were significant (P<0.05). Compared with the control group, the apparent digestibility of dry matter, organic matter and crude protein of group Ⅰ and group Ⅱ were not significantly different (P>0.05). The apparent digestibility of crude fat in the control group was significantly higher than that in the experimental group (P<0.05). It indicats that weaning feeding milk substitute at 30 days of age can help the organ development of lamb and will not have a significant effect on the digestibility of nutrients. The feeding effect of milk substitute A and B in this experiment was good, and it could be adjusted and utilized when the protein raw material soybean meal was in short supply and high price. [ABSTRACT FROM AUTHOR]