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脂肪调整对肉牛剩余料摄入量估计的贡献
Larissa Bordin Temp1, Letícia Pereira2, Marcos Jun-Iti Yokoo3
1Departamento de Zootecnia, Universidade Estadual Paulista (UNESP), Jaboticabal, São Paulo, Brazil.
与未经调整的RFI (RFIW) 相比,调整剩余料摄入量 (RFIF) 以后背脂肪厚度 (RFIF) 对肉牛的遗传评估的影响很小. 选择RFI不太可能对生长,繁殖或尸体特征产生负面影响.
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:
- 剩余料摄入量 (RFI) 是肉牛料效率的一个关键指标.
- 考虑到脂肪沉积,如部脂肪厚度 (RFT),可以改善RFI计算,并保持尸体质量.
- 基因组信息为估计遗传参数和育种值提供了先进的工具.
研究的目的:
- 评估对RFI进行RFT (RFIF) 和未调整的RFI (RFIW) 的调整的好处.
- 估计Nellore牛的RFIF,RFIW和其他重要的生产特征之间的遗传相关性.
- 评估RFIF和RFIW的基因组育种值的准确性,偏差和分散性,使用单步GBLUP (ssGBLUP).
主要方法:
- 分析了来自9094只Nellore动物的表型和基因组数据.
- 线性和值动物模型用于连续和分类特征.
- 单阶段GBLUP (ssGBLUP) 用于估计遗传参数和繁殖值.
主要成果:
- 对RFIW和RFIF的遗传概率估计较低 (分别为0.17和0.16).
- 在RFIW和RFIF之间发现了强烈的遗传相关性 (0.98),与RFT的相关性较弱 (0.15).
- 对RFIF和RFIW基因组育种值的预测准确性,偏差和分散性相似,差异很小.
结论:
- 为RFT调整RFI对遗传评估和育种目标的影响最小.
- RFI与生长,繁殖和尸体特征之间的遗传相关性通常低至中等.
- 考虑到多种特征的平衡选择对于牛肉牛群的整体遗传进步至关重要.
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