奶牛后躯主要体尺与其产奶性能的相关性

Studies on the corrleation of main hindquarters body with milk yield in dairy catlle

采用整群抽样法抽得生产奶牛294头，用测杖和骨盆卡尺测量．并计算后躯形态的11种指标，结果如下：臀端宽与第1，第3胎奶量有中等程度的表型相关（0．3908，P＜o．01；0．3117，P＜0.05）。坐骨结节高比值、欧结节高比值、坐骨宽比值都与产奶量呈中等正相关（0.3101，P＜0、01；0．2937，P＜0．05；0．3715，P＜0．01）髋给节高、尻斜长与第1胎奶量，坐骨结节宽、尻宽指数与第1胎乳胀率的遗传相关分别为0.8679，0．8529，0.7429，0．3655。

Selected 295 head dairy cattle randomly, we measured eleven indexes bysurveying stick and peIvimeter for reflecting their hind quaners frame, and statistic the milkperformance of dairy cattle in this year. The results indicated that there is a apparent correlationbetween pin bone width and milk production in the first and the third embryo (O.390 8** (P<0.01)and 0.31 1 7* (P<0.O5)). There showed middle positive correlation between the tuber ischii heightratio, the tuber coxae height ratio and the tuber ischii width ratio and milk yield (O.310 1**.(P<0.01), 0.293 7* (P<0.05) and 0.371 5** (P<0.01). The genetic correlation between the tubercoxae height, the rump length and milk yield in the first embryo are 0.8679, 0.8529. Also thesame genetic correlation lie in the tuber ischii width, the churl width index and milk farpercentage (0.7429 and 0.3655 respectively).