Effects Of Pellet Diest With Different Nutritional Levels On Performance And Rumen Metabolism Of Fattening Lambs

This experiment was conducted to investigate the effects of complete pellet feed on crossbred male lambs(3.5~4 months) of Poll Dorest( & ) X Tibetansheep(? with three levels(NRC recommended value, 0.9 X NRC, 0.8 X NRC). A single factional designing was adopted and 27 lambs were divided randomly into three groups(A, B, C). The results showed that the average daily gains were 225.6, 238.9, 206.2g in A, B and C, respectively. Average daily gain of B was higher than that of C (p<0.05). The net lamb meat weight in B was higher significantly than that of C(p<0.05). The bone weight in group B was higher significantly than that in group A(p<0.05). The-temb meat/bone in A was the highest as contrasted to that of B and C(p<0.05). The levels of total nitrogen, protein nitrogen and urea nitrogen in rumen fluid were the highest for group A in all of groups(p<0.01). The ammonia nitrogen concentrations of rumen fluid and the urea nitrogen concentration in serum were the lowest in group A as contrasted with that of B and C(p<0.01).The results demonstrate that effect of 0.9 X NRC nutritional level was best on fattening lambs(3.5~4 months) under the condition of feeding with complete pellet diet. The effect of 0.8 X NRC was lower than that of 1 and 0.9 X NRC levels, but the proportion of concentrate in diet of group C was the lowest(36.9%), and it can be used in areas where concentrate was not sufficient...