摘要
黄牛及其改良牛的配种受胎率是体现肉牛生产力的重要指标。为提高母牛的繁殖率和肉牛业的经济效益,本文对多年来通过外部观察和直肠触诊积累的母牛发情时的行为表现及生理特点进行了初步的汇总分析,结果表明:①爬跨行为是群养牛群发情的主要特征,而鸣叫不安、食欲减退是散养牛发情的主要特征;②母牛发情多在早晨6:00-11:00及下午16:00- 19:00,发情持续期平均为25-26 h;③由发情开始到排卵的持续时间平均为33．98 h;排卵高峰多集中在12:00-14:00和晚上23:00到次日凌晨3:00;④卵泡发育以直径0．8-1．2 cm居多;⑤在发情开始后24 h输精,可望有一个较高的受胎率。
Conception rate of yellow cattle and its crossbreds is the important indicator of meat productivity. To improve the reproductivity of cows and economic profit of beef industry, the oestrus behavior and physiological characteristics were summarized based on the experiences of oestrus observation and rectum palpation for many years. The results showed that the mounting behavior is the main expression of oestrus for a herd of cattle, while the restless mooing for individual fed cattle; oestrus of cows often happened between either 6 ： 00 am to 11 ： 00 am or 16 ： 00 pm to 19 ：00 pm with the average continuous oestrus period of 25 to 26 h ; the time between onset of estrus and ovulation averaged 33. 98 h with the peak ovulation time between either 12 ： 00 pm to 14 ： 00 pm or 23 ： 00 pm to 3：00 m; the diameter of most follicles was between 0. 8 cm and 1.2 cm; high conception rate was expected when the insemination was performed at 24 h after onset of oestrus
出处
《中国牛业科学》
2006年第4期12-15,共4页
China Cattle Science
关键词
黄牛
改良牛
发情
排卵
Yellow cattle
Crossbreds
Oestrus
Ovulation
