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在没有损害卡拉库牛的尸体特征和生殖效率的情况下选择体重是可能的吗?

Viviane Andrade Ligori^1,2, Jessica Moraes Malheiros³, Eula Regina Carrara⁴

¹School of Agricultural and Veterinary Sciences, São Paulo State University (UNESP), Jaboticabal, SP, Brazil. vivianeligori@gmail.com.

Journal of applied genetics

|March 17, 2025

概括

卡拉库牛的体重选择显示了与尸体特征的有利遗传相关性,如眼面积和阴囊周长,但与分娩前几天的不良相关性,突出了需要平衡的育种策略的需要.

科学领域:

动物遗传学动物遗传学
量化遗传学量化遗传学
繁殖计划繁殖计划

背景情况:

适应巴西的卡拉库品种已经在40多年里被选择为体重 (BW).
在年轻动物中选择BW可能会对尸体和生殖特征产生负面影响.
了解遗传相关性对于优化繁殖目标至关重要.

研究的目的:

为了估计身体重量 (BW) 和尸体特征 (角面积,身高宽度比,背部脂肪厚度,部脂肪厚度) 以及卡拉库牛的生殖特征 (分娩前几天,围周长) 之间的遗传相关性.
评估长期BW选择对这些特征的影响.
为平衡的遗传改进策略提供见解.

主要方法:

贝叶斯推理使用两种特征的动物模型来估计 (共) 差组件.
分析了一组数据集,包括1966-2022年BW,尸体和生殖特征.
包括829只动物的基因型数据,使用GGP牛100K SNP面板.

主要成果:

在BW和Ribeye面积 (0.51),高宽比率 (0.45) 和阴囊周长 (0.24) 之间发现了有利的遗传相关性 (r_g).
观察到BW和天到分娩 (0.48) 之间存在不利的遗传相关性.
BW显示了与背部脂肪厚度 (-0.07) 的近零遗传相关性,以及与部脂肪厚度 (0.15) 的低有利相关性.

结论:

卡拉库牛中BW的遗传选择对关键的尸体特征和雄性生殖潜力产生积极影响.
在BW和Days to Calving之间存在积极的遗传相关性,这表明女性生殖效率存在潜在的权衡.
均衡的选择策略对于同时改善这种品种的生长,尸体质量和生殖表现至关重要.

关键词:

身体重量体重体重几天到分娩的时间.脂肪的厚度脂肪的厚度遗传相关性遗传相关性基因改进是一种基因改进.高度与宽度的比率是高与宽的比率.里贝耶地区的里贝耶地区.部周长的周长是

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