Genetic parameters for reproductive performance of breeding cows and carcass traits of fattening animals in Japanese Black (Wagyu) cattle
Genetic parameters for reproductive performance of breeding cows and carcass traits of fattening animals in Japanese Black (Wagyu) cattle
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日本黑牛（和牛）种牛繁殖性能和育肥动物胴体性状的遗传参数
DOI：
10.1017/s1357729800053984
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
F. Mukai
中科院分区：
文献类型：
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作者：
K. Oyama;T. Katsuta;K. Anada;F. Mukai
繁殖性能越来越受到肉牛生产者的关注。有人担心，对胴体性状的密集选择可能会降低雌性的繁殖性能。对全年人工授精条件下6个胴体性状的遗传参数以及初产犊日龄、妊娠期、开产日数和产犊间隔进行了估计。从174005头日本黑牛的产犊记录中提取繁殖性状，用31364头胴体记录进行分析。采用动物模型下的限制最大似然法估计参数。AFC、GL、DO和CI的遗传力分别为0.20、0.40、0.05和0.05，胴体性状的遗传力较高，在0.38 ~ 0.56之间。CI与AFC和GL的遗传相关分别为0.25和0.16，而AFC与GL之间没有相关性。胴体性状之间的相关性一般是有利的，皮下脂肪厚度和大理石花纹评分之间的轻微负估计。AFC与胴体重的遗传相关为-0.27，与大理石花纹评分的遗传相关为-0.24。与此相反，GL，DO和CI是遗传独立的胴体性状。繁殖性状和胴体性状之间的遗传关系一般较低，因此没有观察到严重的拮抗作用。结果表明，胴体性状的选择不会影响繁殖性状的遗传进展。
Reproductive performance is receiving increased attention from beef cattle producers. There are concerns that intensive selection for carcass traits might reduce the reproductive performance of females. Genetic parameters among six carcass traits and, age at first calving (AFC), gestation length (GL), days open (DO) and calving interval (CI) under year-round artificial insemination were estimated. Reproductive traits were extracted from 174005 calving records of Japanese Black cows and were analysed with 31364 carcass records. The restricted maximum likelihood procedure under animal models was used to estimate the parameters. Heritabilities of AFC, GL, DO and CI were estimated to be 0.20, 0.40, 0.05 and 0.05, respectively, and those of carcass traits were higher, ranging from 0.38 to 0.56. Genetic correlations of CI with AFC and GL were 0.25 and 0.16, respectively, while no relationship was observed between AFC and GL. Correlations among carcass traits were generally favourable and a slightly negative estimate was obtained between subcutaneous fat thickness and marbling score. Genetic correlations for AFC were -0.27 with carcass weight and -0.24 with marbling score. In contrast, GL, DO and CI were genetically independent of carcass traits. Genetic relationships between reproductive and carcass traits were generally low, and therefore serious antagonism was not observed. The results suggested that selection for carcass traits would not compromise genetic progress in reproductive traits.