Abstract:

75 Nubian ewes were selected (average body weight = 27.14±3.5kg) and divided into 3 groups randomly. Besides basic grazing, three groups of goats were treated 2% compound-premix plus urea 10g/d(the added urea group), concentrated feed 100g/d (the added concentration group)and concentrate supplement 250g/d (the added concentrate supplement group) respectively. Body weight, body conditions and body size were measured at the mating day, 100-day of pregnancy and 150-day of pregnancy, and the numbers of ewes lambing were recorded. The results as follows：Body weights, gain weights and chest girth were significant differences between three groups（P<0.05 or P<0.01）.There were close relationship between the numbers of lamb and BCS and BCI. The numbers of lamb of the added urea group, the added concentration group and the concentrate supplement group were 1.00±0.76, 1.44±0.51 and 1.83±0.49 respectively. The birth weights were 2.55±0.18, 2.51±0.37 and 2.64±0.40kg,there were significant differences between three groups（P<0.05 or P<0.01）. The BCS and BCI of 150-day of pregnancy and lamb numbers(x) have strong relationship：x=-0.4177BCS2 +3.727BCS–4.9185 (R2=0.9984)；x =-0.0018BCI2+0.2795BCI-7.2278 (R2=0.9985).