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Productive indicator in a Holstein dairy herd: growth and height curves, reproductive and productive traits and genetic parameters

机译:荷斯坦奶牛场的生产指标:生长和高度曲线,生殖和生产性状及遗传参数

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摘要

Data on weight, height, productive and reproductive performance of 1,272 Holstein heifers, born from 1990 to 1998, were used to evaluate the growth and height patterns of these females from birth to first calving, and the following traits: weight at first calving (PP), age at first calving (IP), milk production in the first lactation (PL) and first calving interval (IEP), and to estimate genetic parameters of these traits. The von Bertalanffy fitted models were: Yi=802.10 (1-0.630EXP (-0.0022t)) for weight, and Yi=1.40 (1-0.208EXP (-0.0038t)) for height. The average performance of heifers were: height 140cm, weight 602kg and 27 month of age at first calving. The total milk yield was 8,026kg and first IEP was 420 days. The (co)variance components estimates were obtained by a derivative-free algorithm with the DFREML. The estimates of heritabilities were 0.31, 0.35, 0.34, respectively for PP, IP and PL, and 0.10 for IEP. The genetic correlations estimates between PP and PL, PL and IP and IEP and PL were low. The correlation between IEP and PP was 0.49 and between IEP and IP was, -0.69, sugesting an antagonism between the two last traits.
机译:从1990年至1998年出生的1,272头荷斯坦小母牛的体重,身高,生产和生殖性能数据用于评估这些雌性从出生到第一次产犊的生长和身高模式,以及以下特征:第一次产犊(PP) ),第一次产犊的年龄(IP),第一次泌乳的产奶量(PL)和第一次产犊间隔(IEP),并估算这些性状的遗传参数。 von Bertalanffy拟合的模型是:重量= Yi = 802.10(1-0.630EXP(-0.0022t)),高度,yi = 1.40(1-0.208EXP(-0.0038t))。小母牛的平均表现为:初产犊时身高140cm,体重602kg和27个月大。牛奶总产量为8026公斤,首次IEP为420天。 (协)方差分量估计是通过使用DFREML的无导数算法获得的。 PP,IP和PL的遗传力估计分别为0.31、0.35、0.34,IEP的遗传力估计为0.10。 PP和PL,PL和IP与IEP和PL之间的遗传相关性估计值较低。 IEP和PP之间的相关性是0.49,而IEP和IP之间的相关性是-0.69,这表明最后两个性状之间存在拮抗作用。

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