通过超声波检查评估塞内波尔小母牛生殖特征的遗传参数估计

L. S. Pereira, M. Gomes, Ana Cláudia Fagundes Faria, Rodrigo Ribeiro Cunha, Mara Regina Bueno de Matos Nascimento, Ricarda Maria dos Santos, C. Faria
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引用次数: 0

摘要

有关塞内波尔牛生殖道评分(RTS)和前卵泡计数(AFC)的研究十分有限。这些性状至关重要,因为它们与动物的繁殖能力和繁殖性能息息相关。了解这些性状的遗传率和遗传相关性对于指导选育计划和选育繁殖效率更高、生产潜力更大的动物至关重要。因此,本研究旨在利用经直肠超声波技术估算塞内波尔牛体重、RTS 和 AFC 的遗传参数。本研究收集了 850 头 10-16 月龄雌性塞内波尔牛的繁殖数据。在评估时,对以下方面进行了测量:RTS性状(从 1 到 5 分)、AFC(0 到 100)和雌性体重(千克)。通过使用公牛模型进行单变量和双变量分析,估算了变异和协方差成分、遗传力和相关性。AFC(0.52)和体重(0.46)的遗传力估计值适中,RTS(0.12)的遗传力估计值较低。RTS 与 AFC 之间的遗传相关性几乎为零(-0.05)。体重与 AFC 之间的遗传相关性估计为-0.41,而体重与 RTS 之间的相关性为 0.48。对 AFC 和 RTS 进行选择性育种可提高牛群的繁殖效率,使动物的青春期提前,繁殖力提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimation of genetic parameters for reproductive traits evaluated by ultrasonography in Senepol heifers
Studies on reproductive tract score (RTS) and antral follicle count (AFC) in Senepol cattle are limited. These traits are essential as they are linked to the reproductive ability and reproductive performance of animals. Understanding the heritability and genetic correlation of these traits is crucial for guiding selection programs and selecting animals with greater reproductive efficiency and higher production potential. Therefore, this study aimed to estimate the genetic parameters of weight, RTS, and AFC in Senepol cattle using transrectal ultrasonography. Reproductive data were collected from 850 female Senepol cattle aged 10-16 months. At the time of evaluation, the following were measured: RTS traits (scores from 1 to 5), AFC (0 to 100), and female weight (kg). Variance and covariance components, genetic heritability, and correlations were estimated by univariate and bivariate analyses using the bull model. Heritability estimates were moderate for AFC (0.52) and weight (0.46), and low for RTS (0.12). The genetic correlation between RTS and AFC was almost zero (-0.05). The estimated genetic correlation between weight and AFC was -0.41, while the correlation between weight and RTS was 0.48. Selective breeding of AFC and RTS can enhance the reproductive efficiency of the herd and result in animals with earlier pubertal age and increased fertility.
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