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目前黄牛自然发情率一般都在百分之六十左右,还有百分之四十左右的母牛,由于繁养不良及哺乳等原因,当年配种期内不能正常发情配种,这是多年来黄牛递增率不高,发展缓慢的主要原因之一。在当前难以改善饲养管理条件的情况下,为了探讨提高母牛发情率和受胎率的有效方法,1979年本人在鸡东县哈达公社的山河大队、程家大队搞了促性腺激素的应用实验。一、实验方法本实验是分别应用胎盘绒毛膜促性腺激素(HCG)和孕马全血促性腺激素(PMSG)进行的。山河大队实验母牛23
The current natural estrus rate of cattle are generally about 60 percent, there are about 40 percent of cows, due to malnutrition and breastfeeding and other reasons, then the breeding period can not be normal estrus breeding, which is cattle over the years Incremental rate is not high, one of the main reasons for the slow development. In the current situation is difficult to improve feeding and management conditions, in order to explore ways to improve the cow estrus and fertility rate of an effective method, in 1979 I Hada commune in the mountains and rivers brigade, Cheng brigade engage in gonadotropin application experiments. First, the experimental method This experiment was the application of placental chorionic gonadotropin (HCG) and pregnant horse whole blood gonadotropin (PMSG) carried out. Mountain and river brigade experimental cow 23