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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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The Use of an Automated System GreenFeed to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals
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预测受限肉牛的料摄入量

Megan A Gross1, Amanda L Holder2, Alexi N Moehlenpah1

  • 1Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA.

Translational animal science
|February 22, 2024
PubMed
概括

现有的肉牛料摄入量预测方程使用最近的数据进行了评估. 开发了新的模型,占摄入量变化的68%,为非哺乳和哺乳肉牛提供了更好的准确性.

关键词:
牛肉牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛干物质摄入量 干物质摄入量预测方程 预测方程

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科学领域:

  • 动物科学动物科学
  • 类动物营养 类动物营养
  • 牛肉牛生产 牛肉牛生产

背景情况:

  • 准确预测料摄入量对于高效的肉牛管理至关重要.
  • 现有的方程,如NRC (1987,1996) 的方程,在预测肉牛干物质摄入量 (DMI) 方面存在局限性.
  • 以前的模型是使用2002年之前的数据开发的,可能不反映当前的生产系统.

研究的目的:

  • 通过使用最近的数据 (2002年以后) 验证现有的料摄入量预测方程的准确性.
  • 开发和提出替代的,更准确的预测模型来预测牛肉牛的料摄入量.

主要方法:

  • 评估了六种已建立的料摄入量预测方程 (NRC 1987,NRC 1996,Hibberd 和 Thrift 1992).
  • 从2002年以来发表的研究中编制了53种非哺乳母牛和32种哺乳母牛治疗手段的数据集.
  • 使用回归分析开发了新的经验模型,包括缩小体重 (SBW) 和维持饮食净能量 (NEm).

主要成果:

  • 在NRC (1996) 方程中,低估了非哺乳母牛 (平均偏差为2.4 kg/d) 和哺乳母牛 (平均偏差为3.0 kg/d) 的料摄入量.
  • 与观察到的数据相比,非哺乳期和哺乳期的方程都显示了斜率和截面的显著偏差.
  • 在这项研究中开发的最适合的经验模型解释了每日料摄入量的68%的变化.

结论:

  • 现有的料摄入量预测方程需要更新,以准确反映当前的牛肉牛生产.
  • 新开发的经验模型显示了改善肉牛DMI预测的前景.
  • 建议使用独立数据集进一步验证拟议方程.