应用多块分析来确定乳牛持续性关键领域和风险因素
Kerli Mõtus1, Dagni-Alice Viidu1, Triin Rilanto1
1Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, Tartu, Estonia.
Preventive veterinary medicine
|December 7, 2023
概括
这项研究表明,传染病,生育能力和哺乳奶牛的管理显著影响牛的持续性,通过死亡率和杀率来衡量. 关键因素包括乳头病变,呼吸道病毒的存在和挤奶频率,影响群体健康和寿命.
科学领域:
- 兽医医学 兽医医学 兽医医学
- 动物科学动物科学
- 乳制品群管理 乳制品群管理
背景情况:
- 牛的坚持对于乳牛群的利能力和福利至关重要.
- 牛群死亡率 (MR),屠宰率 (CR) 和屠宰牛的平均年龄 (MAofCC) 是牛持续性的关键指标.
- 了解影响奶牛持久性的因素对于改善奶牛养殖场可持续性至关重要.
研究的目的:
- 分析各种生产,管理和疾病因素对牛持续性的重要性.
- 确定影响群体MR,CR和MAofCC的特定变量和主题块.
- 应用多块部分最小方形 (mbPLS) 分析,以全面评估牛持续性驱动因素.
主要方法:
- 包括120个拥有≥100头奶牛的自由养殖奶牛群.
- 收集关于住房,管理实践和牛健康评分的数据.
- 使用多块部分最小平方 (mbPLS) 分析散装坦克牛奶 (BTM) 和母牛血液样本的病原体抗体.
主要成果:
- 传染病 (13.6%),生育管理 (16.3%) 和哺乳奶牛管理 (11.5%) 是对奶牛持久性最有影响力的主题块.
- 显著的危险因素包括后部/部病变,牛呼吸道同胞性病毒的阳性和每天两次奶.
- 保护因素包括机器人挤奶系统,放牧和分娩在集体里,有深厚的床.
结论:
- 多区块PLS是一个有效的工具,用于识别影响奶牛持续性的关键领域和特定风险因素.
- 针对传染病控制,生育管理和特定的奶牛管理实践可以提高群体的寿命并减少损失.
- 牛群大小,牛奶产量,品种和住房系统相互作用,影响牛的整体持续性结果.
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