中文摘要：

为研究早期断奶对舍饲肉用羔羊消化器官发育的影响,选用甘肃肉用绵羊新品种选育群公羔（单羔）55只,分为3个处理,其中28d断奶组（A组）和42d断奶组（B组）各15只,对照组（不断奶,C组）25只,于第7天开始补饲;2个断奶组均于断奶后第0、7和14天（对照组于对应时间）屠宰、取样;分别测定了肝脏和胰腺、各胃室及各肠段相对重量,各胃室相对容积等指标。结果表明,羔羊肝脏和胰腺相对重量（%活体重）均随日龄而增大,B组增幅大于A组。断奶后7d与断奶日相比,A、B组羔羊瘤网胃相对重量（%活体重、%全胃重）分别增加了107.28%、16.22%和40.39%、13.24%,C组对应时段分别增加了29.04%、17.48%和27.10%、4.26%;28d断奶羔羊皱胃相对重量（%活体重）仍有小幅增长（断奶后7与14d较断奶日分别增加了25.39%与7.42%）,而42d断奶羔羊却明显降低（相应为断奶日的78.16%和65.37%）。断奶对全胃及各胃室相对容积（%胃肠道容积）有明显促进作用,且较早断奶的作用更大。断奶日龄对羔羊各肠段相对重量（%活体重、%肠道重）影响不明显（P〉0.05）。结果提示,断奶组羔羊在断奶后7d的前胃及瘤网胃相对重量（%全胃重）均接近成年绵羊水平。舍饲条件下从7日龄开始补饲,在35甚或28日龄时羔羊瘤网胃相对重量和相对容积得到了较充分的发育,35或28d实施早期断奶可行。

英文摘要：

The objective of this study was to investigate the effects of early weaning on the development of digestive organs of barn feeding lambs. Fifty-five male lambs （Gansu modern breeding sheep group, single lamb） were randomly assigned to 3 treatments with 15 （experimental group） or 25 （control group） each. 25 animals were not weaned during the experiment （control）, 15 animals each were weaned at 28（A） or 42 d（B） of age. Supplementary feed were offered at 7 d of age for all the animals. 5 animals from treatments A or B were slaughtered at 0, 7 and 14 d after wea- ning accompanied by 5 animals from the control. The relative weight of liver and pancreas, corn-partments of stomach and intestines, and relative volume of compartments of stomach were deter- mined, respectively. The results indicated that the relative weight of liver and pancreas （% live weight） were increased with age, and the range of increase in group B was greater than that in group A. Compared with the weaned day, the relative weight of reticulorumen （% live weight, % stomach weight） 7 days after weaning were increased by 107.28%, 16.22% and 40.39%, 13.24% in group A and B, respectively, 29.04%, 17.48% and 27.10%, 4.26% in control at the corresponding time, respectively. Compared with the weaned days, relative weight of ahomasums （% live weight） in group A were increased 25.39% and 7.42% after weaned 7 and 14 d, respectively, but the animals in group B were significantly declined 78.16% and 65.37% at the corresponding day, respectively. The effect of weaning on the relative volume （% gastrointestinal tract ca- pacity） in stomach and every compartments of stomach were significant, and more acceleration appeared in more early weaned animals. There weren＇t significant influence on relative weight （% live weight, % intestinal weight） in every compartment of intestine with different weaned days （P〈0.05）. The results indicated that, 7 days after weaning, the relative weight of forestomach and reticulorumen