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Genetic analysis on accumulated productivity and calving intervals in Nelore cattle

机译：Nelore牛积累生产率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：本研究的目的是估算Nelore牛肉中累积生产率（ACP），第一次数间隔（CII），第二次钙舱间隔（CI2），第二个钙舱间隔（CI2）和平均值的遗传参数。 ACP特征是一种繁殖指数，包括每坝出生的小牛总数，断奶犊牛的重量，以及在产犊时的大坝年龄。通过两个特征分析中的平均信息限制最大似然方法估计遗传参数。 ACP的平均遗传性估计为0.17（0.03）。对于CII，CL2和MCI，遗传性估计分别为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。尽管我们的研究中获得了低遗传性估算，但应进一步研究生殖特性，并且必须评估其在选择标准中的纳入，以便提高女性的性能，因为这些特征在牛肉中具有很大的经济意义。积累的生产率可能有助于降低Nelore牛的平均钙狭窄间隔。

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