关于意大利地中海水牛的线性类型特征和功能寿命之间的关系,使用韦布尔比例危险模型
M Gómez-Carpio1, D Rossi1, R Cimmino1
1Italian National Association of Buffalo Breeders, 81100, Caserta, Italy.
Journal of dairy science
|November 9, 2024
概括
非遗传因素显著影响意大利地中海水牛的生产寿命. 关键的影响包括出生年份,生产水平,平价和线性类型特征,韦布尔模型证明了分析的有效性.
科学领域:
- 动物科学动物科学
- 乳制品科学 乳制品科学
- 生殖生物学 生殖生物学
背景情况:
- 生产寿命 (LPL) 是乳牛的关键经济特征.
- 识别影响LPL的非遗传因素对于群体管理和遗传改进至关重要.
- 意大利地中海水牛种群对LPL研究具有独特的特征.
研究的目的:
- 为了确定意大利地中海水牛在生产寿命 (LPL) 上显著的非遗传影响.
- 评估研究效应与LPL之间的关系的区域差异.
- 评估韦布尔比例危险模型对LPL分析的适用性.
主要方法:
- 使用了Weibull比例危险模型,使用了59943只意大利地中海水牛 (2002-2019) 的数据.
- 包括时间依赖的 (羊群年季节,平价,哺乳期,生产) 和独立的 (第一次分娩年龄,出生年份,繁殖类型,分类器,类型特征) 影响.
- 定义LPL为从第一个小牛到杀 (未经审查) 或最后一个测试日 (经审查) 的几天.
主要成果:
- 平均LPL时间为1,604天.
- 出生的年份,生产水平和同等性显著影响了杀风险;风险随同等性而降低.
- 线性类型特征与除风险有显著的关系,较低的得分表明风险更高.
结论:
- 韦布尔模型提供了对LPL的可靠和一致的风险估计.
- 非遗传因素,如生产,均等性和类型特征是水牛长寿的关键决定因素.
- 该模型被推用于未来对该品种LPL的遗传评估.
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