不同月龄绵羊对食物营养利用效率研究

利用祁连山地和河西走廊绿洲作物生态系统的时空差和生产方式所提供的饲草养畜，建立资源互补效应，提高生物效率．结果表明，在相同的营养条件下，随着羊龄的增大，食入营养量、体增重、单位增重消耗的营养量均增多，但营养物质消化率、可消化营养物质的利用率、饲料报酬均有所下降．F测验食入营养物质的差异程度表明，34月龄羊的干物质和蛋白质食入量显著大于22月龄羊(P<0．01)，22月龄羊显著大于10月龄羊(P<0．01)，食入能为34月龄羊与22月龄羊的差异显著(P<0．05)，22月龄羊与10月龄羊差异极显著(P<0．01)．体增重是34月龄与22月龄羊和22月龄羊与10月龄羊差异不显著(P>0．05)，34月龄显著大于10月龄羊(P<0．05)．饲料转化率三组间的差异均不显著，表明10月龄到22月龄羊的生产效率高，能生产高质量的风味羊肉，是适宰羊的年龄段．

Food nourishment utilization efficiency of different month aged sheep

Studies on the food nourishment utilization efficiency of different month aged sheep showed that under same food nourishment condition, the ingested nourishment, weight increase, and nourishment depletion per unit weight increase of sheep were increased with the ingestion of dry matter, and the protein content of 34 months old sheep was significantly higher than that of 22 months old sheep (P < 0.01), and the latter was significantly higher than that of 10 months old sheep (P < 0.01). There was a significant difference of utilization efficiency of the ingested nourishment between 34 months old and 22 months old sheep (P < 0.05) and between 10 months old and 22 months old sheep (P < 0.01). The weight increase was not significantly different (P > 0.05) between 34 months old and 22 months old sheep and between 10 months old and 22 months old sheep, but it was significantly different between 34 months old and 10 months old sheep (P < 0.05). The feed conversion rate among them was not different. All the results showed that 10-22 months old sheep had high production efficiency, and could produce high quality mutton, and hence, this section of age was the suitable age of sheep to be butchered.