适时授精是决定母牛受胎的重要环节。做到授精适时,必须准确地掌握母牛发情和排卵。为提高母牛受胎率,加速黄牛改良。我们于1977～1978年对本省农村人民公社,以放牧饲养为主,冬春营养较差的本地母牛(黄牛及其杂种),在6～9月配种期间的发情规律和授精时机进行了研究,将其结果报告如下。 Timely insemination is to determine the important part of the cow fetus. To be inseminated, we must accurately grasp the cow estrus and ovulation. In order to improve the pregnancy rate of cows, accelerate the improvement of cattle. From 1977 to 1978, we conducted a study on the local rural civic communes, the local cows (cattle and their hybrids), which are dominated by grazing and poorly fed in winter and spring, and the estrus timing and insemination timing during the breeding season from June to September , The result is reported as follows.