青藏高寒草地夏秋季不同轮牧强度对牧草及绵羊的影响

The Effect of Sheep Rotational Grazing Intensities on Forage and Animal Production of Qinghai-Tibet Alpine Rangeland in the Summer and Autumn

本试验是在四川省阿坝州若尔盖县辖曼种羊场进行的。对种羊场的草地进行夏秋季轮牧强度试验，对轮牧小区内牧草产量、营养成份、绵羊生产性能进行测定，结果表明：从保护利用的观点着眼，草地轮牧强度应选择7．5只羊／ha，草地的可利用牧草为90％。日增重与日食量和放牧强度之间存在显著的多元线性回归关系，日增重与采食量呈正比，而与放牧强度呈反比。日采食蛋白与日增重比与日食量和放牧强度之间存在显著的多元线性回归关系，当放牧强度为3．75只羊／ha时日食蛋白与日增重比达到最低，为0．875，即绵羊对蛋白质的利用率最高。

Summer and autumn grazing intensities of sheep ratation were studied in Xiaman SheepBreeding Farm of Ruergai county in Qinghai-Tibet Alpine Rangeland, Scichuan Province. The productionand nutrition of forage and animal productive performance in different grazing intensities were measured. Theresults show that summer and autumn grazing intensity of sheep rotation should be selected at 7. 5 sheep／hastocking rate, and the available forage was 90／ in the rangeland.Significant relationship of liner regression among animal daily increase (DI), daily intake (DIK) andgrazing intensity was getted, Animal daily increase had positive relationship with daily intake and had negative relationship with grazing intensity. The ratio of daily intake protein (DIKP) and daily increase had significant relationship (R ＝0. 999 ) with daily intake and grazing intensity. When grazing intensity was 3. 75sheep/ha, the DIKP/DI reached the lowest (0. 875). It presented that the using rate of protein was the highest at 3. 75 sheep/ha.