【摘要】 结果表明 ,神木黄牛平均初配年龄为 2 .30岁 ,最佳繁殖年龄为 4～ 7岁 ,发情周期为2 2 .30 d,发情持续期 2 .30 d。由于月份、年龄、输精次数、发情阶段不同 ,母牛繁殖受胎率略有差异。了解和掌握这些规律和影响因素 ,对提高母牛的繁殖力有重要的现实意义。更多还原

【Abstract】 Based on statistic data of 1 134 cow of indigenous yellow cattle in Shengmu county, it was showed the first insemination age , the best reproductive age, estrus cycle and estrus duration were 2.3 years old, 4~7 years old, 22.30 days and 2.30 days, respectively, and which changed with month, age, insemination times and estrus stage.更多还原