牦牛牛群结构及周转优化方案

MAKING EXCELLENT SCHEME OF YAK HERD CONSTRUCTION AND TURNOVER

通过对我省和大通牛场牦牛牛群结构现状的调查研究,编制出不同母牛比例的牛群结构及周转表。在四年的试验期内,采取压缩驮牛、育成牛比例和保护适龄母牛的措施,使大通牛场的生产母牛比例由45.06％提高到52.71％后,繁殖成活率,总增率,奶、肉产量,总产值分别达到63.60％,23.53％,5000ks,1460kS,111.21万元,和1985年相比,分别提高12.9％,5.4％,11.94％,38.33％,14.67％,死亡率降低到1.81％。实践证明提出的方案是可行的,经济效益显著。

According to the investigation of the present situation of yak herd eostruction in Qinghai province and especially on Datong Cattle Farm, yak herd constructions in varied cow ratios and turnover table have been made out. The producing cow ratio has been increased from 45.06％ to 52.71％ on Datong Cattle Farm by reducing the ration of pack yak, yaks in rearing stage and protecting the cows in stud within the four-year testing period. Thus, the reproduction survival rate, the total increasing rate, the production of milk and the production of beef and the total output value reached up to 63.60％, 23.53％, 5000kg, 1460kg and 1.1121 million yuan resp., Compared with that of 1985, 12.90％, 5.4％, 11. 94％, 38. 33％ and 14.67％ were increased resp., the mortality rate reduced to 1.81％. It is proved practically that the scheme is feasible, and its economic benefit was significant.