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Genetic analysis on accumulated productivity and calving intervals in Nelore cattle

机译：内罗尔牛累积生产力和产犊间隔的遗传分析

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摘要

The aim of this study was to estimate genetic parameters for accumulated productivity (ACP), first calving interval (CII), second calving interval (CI2), and mean calving interval (MCI) in Nelore beef cattle. The ACP trait is a reproduction index and comprises the total number of calves born per dam, weight of weaned calves, and age of the dam at calving. Genetic parameters were estimated by the average information restricted maximum likelihood method in two trait analyses. The average heritability estimate for ACP was 0.17 (0.03). For CII, Cl2, and MCI, the heritability estimates were 0.02, 0.02, and 0.06, respectively. Genetic correlations between ACP with CI1, Cl2, and MCI were -0.16 +/- 0.47, -0.29 +/- 0.53, and -0.40 +/- 0.27, respectively. Despite of the low heritability estimates obtained in our study, reproduction traits should be further studied and their inclusion in the selection criteria must be evaluated in order to improve the performance of females because these traits are of great economic importance in beef cattle. Accumulated productivity could contribute to decrease the mean calving interval in Nelore cattle.
机译：这项研究的目的是估计内罗尔肉牛的累积生产力（ACP），第一产犊间隔（CII），第二产犊间隔（CI2）和平均产犊间隔（MCI）的遗传参数。 ACP性状是繁殖指数，包括每个大坝出生的犊牛总数，断奶犊牛的体重和产犊时的年龄。通过两次特质分析中的平均信息限制最大似然法估计遗传参数。 ACP的平均遗传力估计值为0.17（0.03）。对于CII，Cl2和MCI，遗传力估计分别为0.02、0.02和0.06。 ACP与CI1，Cl2和MCI之间的遗传相关性分别为-0.16 +/- 0.47，-0.29 +/- 0.53和-0.40 +/- 0.27。尽管在我们的研究中获得的遗传力估计值较低，但应进一步研究生殖性状，并且必须评估其在选择标准中的含量，以提高雌性的性能，因为这些性状在肉牛中具有重要的经济意义。生产率的提高可能有助于减少内罗尔牛的平均产犊间隔。

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