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中文摘要：
本研究利用海丰奶牛场有限公司2009年引进的5 059头澳系进口荷斯坦牛初配月龄及其繁殖性能的数据,分析了不同初配月龄对第二胎受胎情期数、产后第一次配种时间、产犊到受胎时间间隔的影响。结果表明,初配月龄显著影响受胎情期数（0.01
英文摘要：
The effects of the age of first mating on breeding index, the interval from calving to first service, the interval from calving to conception were analyzed using the data of reproductive records in first parity for 5 059 Holstein imported from Australia in 2009 in Haifeng Dairy Cattle Farm, Jiangsu Pro. The results showed that the age of first mating had significant effects on breeding index （0.01 〈P〈0.05） and the interval from calving to first service as well as the interval from calving to conception at P〈0.01. With the delay of the age of first mating, the interval from calving to first service and the interval from calving to conception showed the tendency of shortening. The optimal age of first mating was from 14 to 15 months for Holstein cattle imported from Australia in Haifeng Dairy Cattle Farm based on all information, and these resuhs provided useful information tor the reprnduction management in dairy cattle farm in this region.
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