在撒哈拉以南非洲地区使用牛奶产量的偏差来量化乳牛的一般环境弹性潜力
Richard D Oloo1,2, Raphael Mrode2,3, Jörn Bennewitz4
1Animal Breeding and Husbandry in the Tropics and Subtropics, University of Hohenheim, Stuttgart, Germany.
Frontiers in genetics
|January 1, 2024
概括
牛奶产量偏差的日志转换变异是撒哈拉以南非洲乳牛弹性的遗传指标. 建议使用标准偏差进行精确的遗传选择,以提高适应性和生产力.
科学领域:
- 动物遗传学和动物繁殖
- 乳制品科学 乳制品科学
- 动物的弹性 动物的弹性
背景情况:
- 撒哈拉以南非洲 (SSA) 的低乳制品生产率和牛的适应能力差,需要基因改进战略.
- 对乳牛的一般弹性指标已被提出,但未在SSA背景下进行评估.
- 本研究解决了评估适应性指标在热带环境中的适用性的需要.
研究的目的:
- 评估牛奶产量偏差的日志转换变异 (LnVar),自相关性 (rauto) 和斜率 (Skew) 作为肯尼亚奶牛的一般弹性指标.
- 估计这些指标的遗传参数及其与寿命和平均牛奶产量的关联.
- 为了确定使用实际与标准偏差用于弹性评估的适用性.
主要方法:
- 哺乳曲线是使用测试日牛奶产量记录的量子力回归来建模的,该记录来自2,670头等牛.
- 弹性指标是从观察到的实际和标准偏差从预期的牛奶产量得出的.
- 估计了指标与性能特征 (寿命,平均牛奶产量) 的遗传性和遗传相关性.
主要成果:
- 记录转换变异 (LnVar1,LnVar2) 显示了最高的遗传性 (0.19,0.17),表明遗传对弹性的影响.
- LnVar1和LnVar2在遗传上与改善的寿命相关 (rg = -0.47, -0.49).
- 标准偏差 (LnVar2) 与实际偏差 (LnVar1) 相比,提供了更准确的弹性和更高的平均牛奶产量之间的关联.
结论:
- 牛奶产量偏差的日志转换变异是一个有希望的,可遗传的指标,用于SSA.乳牛的弹性.
- 使用标准偏差至关重要,以避免误解低生产率的动物本质上是有弹性的.
- 使用LnVar指标进行选择性育种以提高弹性,可以提高乳牛在具有挑战性的环境中的生产力和适应能力.
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