犏牛发情期及影响因素分析

Analyses of the Estrus and Influence Factors of Dzo

为了掌握犏牛的发情规律、发情高峰、发情周期以及影响发情的因素等,为适时配种及提高母犏牛受胎率提供数据支撑和科学依据,并为今后推广牦牛经济杂交项目及犏牛繁育奠定良好基础,采取技术人员蹲点形式,观察、配种、记录了3个乡(镇)9个行政村的346头参配母犏牛的发情时间,并以乡(镇)、海拔为基数,统计分析了犏牛的发情时间及影响因素。结果表明,供试犏牛的发情始于7月,8月达到发情高峰,11月发情结束。犏牛的发情期受海拔影响,海拔越低,发情高峰越早,海拔越高,发情高峰越迟;同时受自然地理因素、养殖模式、营养水平及疾病等影响。

In order to master the estrus regulation,estrus peak,estrus cycle,and influence factors of dzo located in different geographical locations,provide data support and scientific basis for timely breeding and improving fertility rate,and lay a good foundation for the promotion of economic hybridization projects and calf breeding programs in the future,the estrus time of 346 female dzo was observed and recorded,and the estrus time and influence factors were analyzed according to their respective geographical locations. The results showed that the estrus time of dzo in three different geographical locations began in July,reached the peak in August,and then ended in November. Moreover,the estrus period of the dzo was affected by different altitude,and low altitudes results in early estrus peak,whereas higher altitudes delayed the estrus cycle from reaching its peak. Natural geographical factors,breeding patterns,nutritional levels,and diseases also influenced the estrus cycle of dzo.