用单一和重复记录估计伊朗霍尔斯坦牛的生产和生殖特征的遗传参数,使用单一和重复记录
Reza Tohidi1, Behrouz Mohammad Nazari2
1Department of Animal Science, Faculty of Agriculture and Animal Science, University of Torbat-E Jam, Torbat-E Jam, Iran. r.tohidi@tjamcaas.ac.ir.
Tropical animal health and production
|November 7, 2023
概括
伊朗霍尔斯坦牛的遗传参数显示出改善牛奶产量和生殖特征的潜力. 重复性估计允许根据第一个哺乳记录进行选择,这表明繁殖价值的进展.
科学领域:
- 动物遗传学和动物繁殖
- 乳制品科学 乳制品科学
- 量化遗传学 量化遗传学
背景情况:
- 了解遗传参数对于乳牛的有效繁殖计划至关重要.
- 伊朗的霍尔斯坦牛代表了乳制品生产研究的重要群体.
- 以前的研究可能没有完全捕捉到这一特定人群中的遗传潜力和趋势.
研究的目的:
- 估计伊朗霍尔斯坦牛的生产性 (牛奶,脂肪,蛋白质产量) 和生殖性 (第一次分娩的年龄,哺乳期的长度) 属性的遗传参数.
- 在11年的时间里 (2006-2018) 评估生产特征的遗传趋势.
- 评估使用第一次哺乳记录进行选择的可行性.
主要方法:
- 分析了2006年至2018年期间记录的伊朗霍尔斯坦牛的数据.
- 采用动物模型,结合了第一平价和前三个哺乳记录.
- 使用单记录和重复测量模型估计了可继承性和可重复性.
主要成果:
- 牛奶,脂肪和蛋白质产量的遗传概率估计在0.19-0.29 (单一记录) 和0.15-0.19 (重复模型) 之间.
- 对于第一次分娩时的年龄的遗传率为0.16,对于哺乳期的长度是0.02.
- 牛奶,脂肪和蛋白质产量的重复性估计分别为0.38,0.34和0.36.
- 对生产特征观察到一种积极的遗传趋势,表明遗传收益.
- 牧场年度季节效应表明,农场管理和环境条件有所改善.
结论:
- 估计的遗传性和可重复性值表明,牛奶,脂肪和蛋白质产量的遗传改进潜力,以及第一次分娩时的年龄.
- 基于第一次哺乳记录的选择是可行的,因为高可重复性估计.
- 积极的遗传趋势证实了伊朗霍尔斯坦种群的成功育种策略和改善的育种价值.
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