对内罗尔牛的维护能源需求和剩余料摄入量的遗传参数的估计
Roberto D Sainz1, Fernando Baldi2, Larissa Bordin Temp2
1Department of Animal Science, University of California, Davis, California, USA.
概括
基因选择可以降低肉牛的维护能量需求 (NEmR) 和剩余料摄入量 (RFI). 这种方法可以改善生长,尸体特征和生殖早发性,提高牛肉生产的整体效率.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 牛肉牛生产 牛肉牛生产
背景情况:
- 料效率对于可持续的牛肉生产至关重要.
- 维护能源要求 (NEmR) 和剩余料摄入量 (RFI) 是影响料效率的关键特征.
- 了解这些特征和生产指标之间的遗传关联对于有效的育种计划至关重要.
研究的目的:
- 估计牛肉牛中NEmR,RFI和其他生产特征的遗传性和遗传相关性.
- 评估基因选择对降低NEmR和RFI的可行性和潜在影响.
- 通过遗传选择,为提高牛肉生产效率的策略提供信息.
主要方法:
- 分析了来自巴西41个料效率试验 (4381只动物) 的数据.
- 使用线性和值动物模型,分别用于连续和值特征.
- 估计的遗传性和遗传/表型相关性.
主要成果:
- 对于RFI (0.190) 和NEmR (0.193) 的低遗传率估计.
- 在RFI和NEmR (0.701) 之间存在很高的遗传相关性.
- 适度的生长/尸体特征遗传性,高的性早发性;NEmR与尸体/生殖特征的基因相关性较低.
结论:
- 减少NEmR的基因选择是可行的,可以减少干物质摄入量 (DMI) 和RFI.
- 选择改进的RFI可以识别具有较低NEmR的动物.
- 长期选择减少RFI和NEmR为生长,尸体质量和生殖特征提供了好处,提高了牛肉生产效率.
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