估计原生母牛的生育容易度和内罗尔牛的经济重要特征之间的遗传相关性
Maria Paula Marinho de Negreiros1, Sabrina Thaise Amorim2, Raysildo Barbosa Lôbo3
1Faculdade de Zootecnia e Engenharia de Alimentos, Departamento de Zootecnia, Universidade de São Paulo, Pirassununga, Brasil.
概括
在Nellore牛群中选择生育容易 (CE) 是可行的,直接遗传率为0.27. 建议采用考虑CE和出生体重的多特征方法,以减少分娩困难,而不会对其他重要的生产特征产生负面影响.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 牛肉牛的繁殖 牛肉牛的繁殖
背景情况:
- 产容易 (CE) 是肉牛生产的关键特征,影响利能力和动物福利.
- 了解CE的遗传基础及其与其他特征的相关性对于有效的育种计划至关重要.
- 尼罗尔牛是一种著名的肉牛品种,需要对诸如分娩容易等特征进行特定的遗传评估.
研究的目的:
- 为了估计Nellore牛的分娩容易 (CE) 的遗传参数.
- 确定CE与各种生长,生殖,尸体和料效率特征之间的遗传相关性.
- 为开发Nellore牛的最佳多特征选择策略提供见解.
主要方法:
- 利用两种特征值线性动物模型和两种特征值动物模型进行遗传参数估计.
- 分析了CE的表型,早期分娩的概率,第一次分娩的年龄,稳定性,阴囊周长,牛的生产力,雄性青春期,妊娠时间,出生体重,调整的体重,成年牛的体重,框架分数,部高度,肋眼区域,背部脂肪厚度,部脂肪厚度,肌肉脂肪,剩余料摄入量和干物摄入量.
- 计算了CE的直接和母性遗传概率估计,以及CE和其他特征之间的遗传相关性.
主要成果:
- 在初代的Nellore公牛中,CE的直接遗传率估计为0.27,母亲遗传率为0.19,表明选择的可行性.
- CE和出生体重 (BW) 之间的遗传相关性表明,仅选择减少的BW并不是改善CE的最佳选择.
- 在CE和其他生产特征之间观察到显著的遗传相关性,突显了需要采用多特征方法的需要.
结论:
- 为了提高内罗尔牛的分娩容易度,选择是基因可行的.
- 建议采用结合CE和BW的多特征选择模型,以减少分娩困难,特别是早熟的公牛,而不会影响生长,繁殖,料效率或尸体特征.
- 将CE纳入选决策对于提高雌性生殖早期性和尽量减少分娩问题至关重要.
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