| 闽北群牧黄牛繁殖规律的观察研究 |
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| 引用本文： | 倪金沐,邹霞青,胡木石,傅共守.闽北群牧黄牛繁殖规律的观察研究[J].福建农林大学学报(自然科学版),1982(4). |
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| 作者姓名： | 倪金沐 邹霞青 胡木石 傅共守 |
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| 摘 要： | 近三年,我们对闽北群牧黄牛的繁殖规律进行了观察研究。结果表明:闽北黄牛初情期为1.5～2岁,自然繁殖率为58％,可繁殖年限为13—15年,发情月份多集中在6—12月份,发情周期平均20.9±10.2天,发情持续时间为11.99±6.12小时,排卵时间在发情停止后9.32±3.97小时,适宜输精时机应掌握在母牛接受爬跨后的9—11小时,受胎率较高。母牛的类别、膘情、卵泡发育的不同阶段,输精的方法和部位对受胎率均有直接的影响,而情期内输精一次和二次对受胎率的影响差异不显著。妊娠母牛有61％的胚胞附植在右侧子宫角。有18.42％怀孕母牛表现不规则的妊娠发情,妊娠期平均为270.9±6.6天。分娩过程持续时间平均为1.40±0.5小时,有53.7％母牛在白天分娩。公母犊性别比例接近1∶1,母牛有良好的保胎和护仔性能。
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OBSERVATIONS AND INVESTIGATIONS ON THE REPRODUCTIVE FREQUENCY OF YELLOW COW HERDS IN NORTHERN FUJIAN |
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| Abstract: | We conducted investigations to observe the reproductive freqency of herds of yellow cow in Northern Fujian in recent three years.Results showed that female yellow cows in Northern Fujian started oestrus at the age of 1.5-2 yrs old.The natural fertiled rate was 58%.The limit of potent breeding years lasted as long as 13-15 years.The time of oestrus mostly occurred on the months of June to December.The period of rhythmic.oestrus averaged 20.9±10.2 days.Oestrus duration was 11.99±6.12 hrs.9.32±3.97 hrs.after oestrus came the time of ovulation.To obtain higher pregnant rate,the optimum time of insemination should be 9-11 hrs after the female willing to accept mounting of the male.Kinds of female cow.together with well development,growth of ova,method and position of insemination,etc all affected fertilization directly.Within the duration of oestrus,one or two times of insemination made no difference in successful fertilization.61% of the embryo attached to the right side of the uterus in the pregnant cows.18.42% pregnant cows had abnormal oestrus at the state pregnancy.The average pregnant period was 270.9+6.6 days.The time for delivery averaged 1.40±0.5 hrs.Almost 5.37% of the mother cows gave birth at day time.The birth male and female calves approached the ratio of 1:1.The mother cow protected,the foetus quite well and as a general the mother cows reserved good foetus protecting ability. |
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