中文摘要：

随着人工授精技术在畜牧业中的广泛应用,优秀种公畜的利用率得到了极大提高。而人工授精成功的关键是输精的准确性和及时性,因此如何准确预测排卵时间及输精时间是提高人工授精效果的重要途径,也是当前畜牧工作者高度关注的问题。家畜的发情排卵受到体内生殖激素的精密调控,定时输精技术就是在利用生殖激素进行同期发情、同期排卵的基础上,通过调控母畜的发情和排卵来确定人工输精的最佳时间,以期达到提高家畜繁殖性能、减少发情鉴定工作量和促进养殖场批次化管理的目的。作者综述了家畜定时输精的原理及当前的应用现状,同时对其发展前景进行了展望,以期为畜牧业繁殖新技术的研究和应用提供参考依据。

英文摘要：

With the wide application of the artificial insemination （AI）in animal husbandry,the utilization rate of excellent sire got greatly improved.The key point of AI is predicting the time of ovulation and insemination accurately.It is also the point which the animal husbandry technolo-gists highly concerned to improve the application effect of AI.Estrus and ovulation are regulated minutely by reproductive hormones in vivo in farm animals.Timed artificial insemination （TAI） is based on the synchronization of estrus and ovulation,both of which are triggered by reproduc-tive hormones.So the optimal time for AI could be determined from the reproductive hormone treatment.The purpose of TAI is to improve the reproduction performance of farm animals,re-duce the workload of identification of estrus,and promote batch management.This review mainly summerized the principles of TAI and its applications status,and the prospects was also dis-cussed.It would provide a reference for the research and application of new reproductive technolo-gy in farm animals.