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Genetic parameters of reproductive traits from artificial insemination records of Japanese Black cows

机译：日本黑牛人工授精记录的生殖特性遗传参数

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Decline in reproductive performance directly affects the cost of calf production in the beef industry. The objective of this study was to estimate heritability, repeatability and genetic correlation among female reproductive traits, and to determine the most appropriate trait for improving reproductive performance in Japanese Black cows. The traits studied were; non-return rate (NRR), number of inseminations (IN), days from first to successful insemination (FS), gestation length (GL), days from calving to first insemination (CF), days open (DO), pregnancy rate (PR), calving interval (CI) and age at calving (AC). Data across multiple parities were analyzed by using a multiple-trait model under which the performance of a trait in different parities was treated as a different trait, and by using a repeatability model for treating records of multiple parities as repeated measurements. AC comprises age at first calving (AFC), age at second calving (ASC) and age at third calving (ATC) under the multiple-trait model. Genetic parameters were estimated by restricted maximum likelihood (REML). The estimated heritability of traits showed little variation among parities. Heritability of AC was higher than of the other traits, although it was lower in later parities; 0.158, 0.107 and 0.088 for AFC, ASC and ATC, respectively. The highest repeatability was observed for CF (0.142) and the lowest for FS (0.036). The genetic correlations between the same traits across parities were generally high, ranging from 0.72 to 0.99. The lowest genetic correlation in absolute values was observed between CF and IN (-0.075) and the highest between DO and CI (0.957). AFC was concluded to be the most promising trait for genetic evaluation of female reproductive traits because it demonstrated higher heritability and moderate to high genetic correlations with NRR, GL, CF, DO, PR, CI, IN and FS. Selection of AFC will provide higher genetic improvement in reproductive performance of Japanese Black cows.
机译：生殖性能下降直接影响牛肉行业的小牛生产成本。本研究的目的是估算遗传性，可重复性和雌性生殖特征之间的遗传相关性，并确定最适合提高日本黑奶牛的生殖性能的特性。研究的特质是;非返回率（NRR），营养次数（in），从第一到成功授精的天数（fs），妊娠长度（gl），几天到第一次授精（cf），天开（do），怀孕率（ PR），产犊间隔（CI）和时效（AC）。通过使用多个特征模型来分析多个阶段的数据，该模型在不同间位中的性能被视为不同的特征，并且通过使用重复性模型作为重复测量处理多个间隔的记录。 AC包括在第一次产犊（AFC）的年龄，在多个特征模型下在第二次产犊（ASC）和年龄的年龄和年龄。通过限制最大可能性（REML）估计遗传参数。估计的特质的可遗传性显示出阶段之间的变化很小。 AC的遗传性高于其他特征，尽管在后期的阶段较低; AFC，ASC和ATC分别为0.158,0.107和0.088。对于CF（0.142）观察到最高的可重复性，并且FS的最低可重复性（0.036）。跨前景的相同性状的遗传相关性通常为高，范围为0.72至0.99。在CF和（-0.075）之间观察到绝对值的最低遗传相关性，并且在DO和CI之间的最高（0.957）。结论是亚洲综合症是对女性生殖特征的遗传评估最有前途的特质，因为它表现出更高的遗传性和中度与NRR，GL，CF，DO，PR，CI，IN和FS的高遗传相关性。 AFC的选择将在日本黑奶牛的生殖性能方面提供更高的遗传提高。

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