摘要
Abstract
[Objective]To explore the key factors affecting the fertility of dairy cows,to ensure the effective transmission of good traits and to improve the overall reproductive efficiency.[Method]Reproduction data from a large-scale dairy farm were collected and analysed to systematically assess the effects of month of breeding,cumulative litter size and quality of uterine repair on conception rate.[Result]The conception rate of cows in January,September,October and December was significantly higher than that of other months,while July and August showed lower conception rates,with significant differences(P<0.05)between these months.Further analyses showed that first time cows(1 lactation)had higher conception rate compared to multiple lactation cows,which was significantly different(P<0.05).In addition,the state of uterine repair after parturition had a significant effect on conception rate,with cows with a well repaired uterus free of sepsis showing a higher conception rate.[Conclusion]In the process of cow breeding,reasonable selection of breeding month,priority selection of cows with appropriate litter size,and attention to post-partum uterine repair management are crucial to promote the selection and inheritance of excellent traits and improve the overall reproductive efficiency of dairy cattle populations.关键词
奶牛/泌乳/胎次/受胎率Key words
dairy cow/lactation/parity/conception rate
