意大利地中海水牛的繁殖特征的遗传参数,使用牛奶产量作为相关特征
M Gómez-Carpio1, A Cesarani2, G Zullo1
1Italian National Association of Buffalo Breeders, 81100 Caserta, Italy.
Journal of dairy science
|August 29, 2023
概括
意大利地中海水牛的遗传评估侧重于改善雌性生育特征,如第一次分娩的年龄和分娩间隔. 低遗传性表明环境因素是关键因素,而与牛奶产量的不利遗传相关性需要谨慎的育种策略.
科学领域:
- 动物遗传学动物遗传学
- 乳制品科学 乳制品科学
- 生殖生物学 生殖生物学
背景情况:
- 意大利地中海水牛的遗传评估历来优先考虑了生产特征.
- 女性的生育能力对于奶牛场的利能力至关重要,需要基因改进.
- 关键生育指标包括第一次分娩的年龄 (AFC),第一次和第二次分娩之间的间隔 (CIV1),以及随后的分娩间隔 (CIV2_12).
研究的目的:
- 估计意大利地中海水牛中女性生育能力关键特征的遗传参数.
- 使用大量人口数据集计算生育特征的繁殖值.
- 为了研究生育特征与牛奶产量之间的遗传相关性.
主要方法:
- 通过贝叶斯推理 (GIBBS1F90) 使用多特征动物模型估计了遗传参数.
- 使用最佳线性无偏预测 (BLUPF90) 方法计算了繁殖值.
- 数据包括7915头奶牛用于参数估计和236087头奶牛用于养殖价值计算.
主要成果:
- 发现生育特征的遗传性和重复性估计值很低.
- 生育特征之间的遗传相关性中等至高 (0.100.92).
- 在牛奶产量和生育特征之间观察到不利的遗传相关性 (0.230.48).
结论:
- 低遗传率表明,环境对水牛生育能力有很大的影响.
- 育种计划应该考虑乳产量和生育能力之间的不良遗传相关性.
- 这些发现为未来的意大利地中海水牛生育基因改进策略提供了基础.
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