当前,农区养牛放牧条件较差。加之部分母牛仍负繁重劳役,膘情不好,有的母牛长期不发情,影响配种。如能利用外源性保性腺激素诱导母牛在预定的时间里集中发情,都将提高黄牛配种率,加快改良进度。本期是在挂锄后期,母牛集中放牧增标复壮的基础上,注射孕马血清促性腺激素(PMSG)和绒膜促性腺激素(HCG),以期观察诱导母牛发情和配种效果。 At present, grazing conditions in rural areas are poor. In addition, some cows still bear heavy and heavy labor services, they are not well-off. Some cows do not have long-term estrus, affecting breeding. If we can use exogenous gonadal hormones to induce cows to concentrate estrus in a predetermined time, they will increase the rate of cattle breeding and speed up the progress of the improvement. This issue is based on the late grazing of hoes, grazing concentrated cows recuperate, pregnant women injected with serum gonadotropin (PMSG) and chorionic gonadotropin (HCG), in order to observe the induction of cow estrus and breeding effect.