Relationship between Somatic Cell Score and Fat Plus Protein Yield in the First Three Lactations in Spanish Florida Goats

Dairy Pub Date : 2023-12-21 DOI:10.3390/dairy5010001

Rocío Jiménez-Granado, Antonio Molina, M. Sánchez Rodríguez, C. Ziadi, Alberto Menéndez Buxadera

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Abstract

The aim of this study was to estimate genetic parameters of somatic cell score (SCS) and fat plus protein yield (FPY) using repeatability (RM) and random regression (RRM) models in Florida goats. The data consisted of 340,654 test-day controls of the first three lactations, and the pedigree contained 36,144 animals. Covariance components were estimated with a bivariate RM and RRM using the REML approach. Both models included as fixed effects the combination of herd and control date, litter size, kidding number and lactation length, and as random effects, the additive genetic and permanent environmental effects. A variation in the shape of the genetic parameters along the lactation curve was observed for both traits, and h2 oscillated between 0.272 and 0.279 for SCS and 0.099 and 0.138 for FPY. The genetic correlation between SCS and FPY was negative and medium (−0.304 to −0.477), indicating that a low-SCS EBV is associated with a genetic predisposition to high FPY production. Our results showed that given the magnitude of h2 for SCS and its rg with FPY, the SCS could be used as a selection criterion to increase resistance to mastitis, thus obtaining an improved dairy and cheese aptitude in this breed.

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西班牙佛罗里达山羊前三个泌乳期体细胞评分与脂肪和蛋白质产量之间的关系

本研究旨在利用重复性（RM）和随机回归（RRM）模型估计佛罗里达山羊体细胞评分（SCS）和脂肪加蛋白质产量（FPY）的遗传参数。数据包括前三个泌乳期的 340,654 个测试日对照，血统包含 36,144 头动物。采用 REML 方法，用双变量 RM 和 RRM 估算了协方差成分。这两个模型都将牛群和对照日期、窝产仔数、开玩笑次数和泌乳期长度的组合作为固定效应，并将遗传效应和永久环境效应作为随机效应。两个性状的遗传参数沿泌乳曲线的形状都有变化，SCS 的 h2 在 0.272 和 0.279 之间波动，FPY 的 h2 在 0.099 和 0.138 之间波动。SCS 和 FPY 之间的遗传相关性为中等负值（-0.304 到 -0.477），表明低 SCS EBV 与高 FPY 产量的遗传倾向相关。我们的研究结果表明，鉴于 SCS 的 h2 值及其与 FPY 的 rg 值的大小，SCS 可用作提高乳腺炎抵抗力的选择标准，从而提高该品种的乳制品和奶酪生产性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dairy

CiteScore

4.40

自引率

0.00%

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