Jersey cattle are the second most prominent breed in the United States and represent a growing portion of the dairy cow population in the United States. The objectives of our study were to determine the male lineages of Jersey sires with official genetic evaluations and to determine whether there are differences in sire conception rate among lineages. Paternal lineages back to the 1950s were extracted from genetic evaluation files of the Council on Dairy Cattle Breeding (CDCB, Bowie, MD) for all sires with an official United States genetic evaluation and that were enrolled with the National Association of Animal Breeders (Madison, WI). Further tracing of male lineages was performed by accessing the pedigree database of Jersey Origins LLC (Stitzer, WI). Only paternal lineages were considered because we were interested in transmission of the Y chromosome. Sire conception rate evaluations were also retrieved from CDCB for 1,116 bulls. Nearly all North American bulls born in the decade beginning 2010 could be traced to Secret Signal Observer or Advancer Sleeping Jester, who together account for 98.9% of paternal lineages. Both bulls plus the 3 additional bulls that account for the remaining 1.1% of current descendants can be traced to a single bull (Champion Flying Fox) born on the island of Jersey in 1898. When considering sires imported into the United States, the majority (71%) trace their paternal lineage to Secret Signal Observer or Advancer Sleeping Jester, and 97% can be traced to Champion Flying Fox. Sire conception rates were higher by 0.30 percentage points in the Secret Signal Observer line than in the Advancer Sleeping Jester line, which was significant. The small number of paternal lineages for recently born artificial insemination Jersey sires indicates that there is limited genetic diversity for much of the Y chromosome, suggesting that autosomal variation may be a more important source for differences in male fertility than the Y chromosome.

泽西牛是美国第二大最重要的品种，占美国奶牛人口的比例不断增加。我们研究的目的是通过官方遗传评估确定泽西公牛的男性血统，并确定各血统中公牛受胎率是否存在差异。可以追溯到1950年代的父系血统是从拥有美国官方基因评估的所有公牛的奶牛育种委员会（CDCB，Bowie，MD）的遗传评估文件中提取的，并已加入美国全国动物育种家协会（Madison， WI）。通过访问Jersey Origins LLC（威斯康星州Stitzer）的血统数据库，对男性血统进行了进一步的追踪。仅考虑父系血统，因为我们对Y染色体的传播感兴趣。还从CDCB检索了1,116头公牛的受胎率评估。从2010年开始的十年中，几乎所有北美公牛都可以追溯到Secret Signal Observer或Advancer Sleeping Jester，它们共同占父系的98.9％。这两头公牛加上另外3头公牛（占当前子孙的剩余1.1％）都可以追溯到1898年生于泽西岛的一头公牛（Champion Flying Fox）。考虑到从美国进口的公牛，多数（ 71％）可以将其父系血统追溯到Secret Signal Observer或Advancer Sleeping Jester，97％可以追溯到Champion Flying Fox。父亲受胎率提高了0。“秘密信号观察者”行中的百分比比“进步睡眠者小丑”行中的30个百分点高，这是非常重要的。刚出生的人工受精泽西公牛的父系谱系数量很少，这表明Y染色体大部分区域的遗传多样性有限，这表明常染色体变异可能是比Y染色体更重要的导致男性生育力差异的来源。