改进干物质摄入量的估计,使用在广的牧场上放牧的牛身上精确的体重
Hector Manuel Menendez1, Jameson Robert Brennan1, Krista Ann Ehlert2
1Department of Animal Science, South Dakota State University, Rapid City, SD 57703, USA.
Animals : an open access journal from MDPI
|December 23, 2023
概括
使用个体动物体重 (BW) 数据的精确畜牧管理可以优化牧场养殖率. 这种精密系统模型 (PSM) 通过考虑干物摄入量 (DMI) 的变化来提高料利用率和可持续性.
科学领域:
- 牧场生态与管理 牧场生态与管理
- 精准畜牧养殖 精准畜牧养殖 精准畜牧养殖
- 动物营养和生产
背景情况:
- 传统的牧场养殖率计算依赖于群体水平的概括估计,通常使用动物单位月.
- 干物质摄入量 (DMI) 的个体动物变化显著影响料消费和放牧时间.
- 精密技术提供了一个机会,通过结合个体动物数据来完善养殖率计算.
研究的目的:
- 开发一个精确系统模型 (PSM),根据精确的体重 (BW) 预测总DMI和牧场面积要求.
- 为了将PSM预测的养殖率与使用初始或中期季节BW的传统群体水平方法进行比较.
- 评估单个精确BW数据对广泛的牧场系统中养殖率决策的影响.
主要方法:
- 在Vensim和R中构建了一个确定性模型,将个别精度的BW整合到标准牧场方程中.
- 该模型估计了个人DMI,每日群体DMI以及特定放牧期所需的牧场面积 (%BW).
- 案例研究使用了两个牧场实验中的小牛和小牛的精确体重数据来开发和测试PSM.
主要成果:
- 在这两种案例研究中,使用个别精确的BW (情景3) 需要比最初的BW (情景1) 更多的牧场面积.
- 案例研究1 (母牛) 显示需要额外的73.41公,而案例研究2 (公牛) 显示平均每牧场增加4.4公.
- 灵敏度分析显示,模拟的料消费和必要的牧场面积存在很大差异,突出显示了模型的响应性.
结论:
- 通过利用基于个体BW的精确DMI估计,PSM有效地识别了潜在的库存不足和库存过剩情况.
- 精密工具为在广的牧场上提高动物和植物的生产力提供了实际应用.
- 实施精确的DMI估计有助于提高牧场牧场管理中的环境可持续性.
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