谷氨酰胺对断奶肉兔肠道发育的影响

本试验旨在研究谷氨酰胺对肉兔肠道发育的影响。试验选择28日龄断奶新西兰白兔360只,随机分成4个组,每个组9个重复,每个重复10只(公母各占1/2)。4组试验兔分别饲喂在基础饲粮基础上添加0(对照)、0.4%、0.8%和1.2%谷氨酰胺的试验饲粮,试验期为4周。结果表明:饲粮添加谷氨酰胺对肉兔35、42和56日龄时的胃重、盲肠重和小肠长度以及56日龄时的小肠重无显著影响(P0.05),但饲粮添加0.8%谷氨酰胺可以显著提高肉兔35和42日龄时的小肠重(P0.05);饲粮添加0.8%和1.2%谷氨酰胺可以显著提高肉兔35和42日龄时的十二指肠和空肠绒毛高度(P0.05),同时饲粮添加0.8%谷氨酰胺还可以显著提高肉兔35和42日龄时的回肠绒毛高度以及56日龄时的十二指肠和空肠绒毛高度(P0.05);饲粮添加0.8%谷氨酰胺可以显著降低肉兔35和42日龄时的十二指肠和空肠隐窝深度以及35日龄时的回肠隐窝深度(P0.05)。由此可见,饲粮添加谷氨酰胺可以促进肉兔断奶后1~2周的肠道发育,本试验条件下,肉兔饲粮中谷氨酰胺适宜添加水平为0.8%。

Effects of Glutamine on Intestinal Development of Meat Rabbits

This experiment was conducted to evaluate the effects of glutamine on intestinal development of meat rabbits.Three hundred and sixty 28-day-old weaned New Zealand meat rabbits were selected and randomly divided into 4 groups with 9 replicates per group and 10 meat rabbits (half male and half female) per replicate.Meat rabbits in the 4 groups were fed experimental diets supplemented with 0,0.4%,0.8% and 1.2% glutamine based on a basal diet,respectively.The experimental period was 4 weeks.The results showed that glutamine supplementation had no significant effects on stomach weight and cecum weight at 35,42 and 56 days of age and small intestine length at 56 days of age for meat rabbits (P>0.05),but diet supplemented with 0.8% glutamine could significantly increase the small intestine weight at 35 and 42 days of age for meat rabbits (P<0.05).Diet supplemented with 0.8% and 1.2% glutamine could significantly elevate the duodenum and jejunum villus height at 35 and 42 days of age for meat rabbits (P<0.05),and diet supplemented with 0.8% glutamine could significantly elevate the ileum villus height at 35 and 42 days of age and duodenum and jejunum villus height at 56 days of age for meat rabbits (P<0.05).Diet supplemented with 0.8% glutamine could significantly reduce the duodenum and jejunum crypt depth at 35 and 42 days of age and ileum crypt depth at 35 days of age for meat rabbits (P<0.05).In conclusion,glutamine supplementation can improve the intestinal development of meat rabbits at 1 to 2 weeks post weaning.In this experiment condition,the suitable supplemental level of glutamine in the diet of meat rabbits is 0.8%.