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补充希斯蒂丁在奶牛的乳性能的影响:一个元分析

S E Räisänen¹, H Lapierre², W J Price³

¹Department of Animal Science, The Pennsylvania State University, State College, PA 16802; ETH Zürich, Department of Environmental Science, Institute of Agricultural Sciences, Zürich 8092, Switzerland.

Journal of dairy science

|July 27, 2023

概括

补充胺 (His) 提高了奶牛的表现,增加了牛奶产量和蛋白质. 鲁门保护了他的,并注入了他的,显示了不同的有效性,突出了乳牛营养中他的重要性.

科学领域:

动物科学动物科学
营养生物化学营养生物化学
牛奶牛的营养牛奶牛的营养

背景情况:

胺 (His) 是一种必需的氨基酸,对乳牛的蛋白质合成和代谢功能至关重要.
了解补充His对哺乳性能和营养利用的影响对于优化奶牛饮食至关重要.
之前的研究表明,His补充剂的潜在益处,但需要全面的元分析来巩固研究结果.

研究的目的:

进行一项元分析,研究补充希斯蒂丁对哺乳能力的影响,血希斯度,以及乳牛中消化性希斯利用效率.
为了评估不同胺补充方法 (皮保护,注入) 和饮食中代谢蛋白质水平对奶牛反应的影响.
探索可消化的供应和关键生产参数之间的关系,包括干物质摄入量,牛奶产量和牛奶真正的蛋白质产量.

主要方法:

1999年至2022年间发表的22项研究的元分析,涉及各种histidine补充策略和食料类型 (玉米料,草料).
计算了标准化平均差异 (SMD),以评估胺补充剂对生产参数和血度的影响大小.
进行了回归分析,以调查消化剂供应和响应变量之间的非线性关系,并比较不同的补充方法.

主要成果:

胺补充剂显著增加了血His度 (SMD = 1.39),干物摄入量 (SMD = 0.240),牛奶产量 (SMD = 0.667),牛奶真蛋白度 (SMD = 0.236) 和牛奶真蛋白产量 (SMD = 0.581).
对牛奶真蛋白度和产量的积极影响在使用可代谢蛋白质缺乏饮食的研究中更为明显.
生产参数对增加His供应呈现非线性反应,与注入His相比观察到的效果更大,而His不受皮保护.

结论:

伊斯蒂丁是一种必需的氨基酸,可显著提高奶牛的哺乳性能和蛋白质合成.
饮食中代谢蛋白质的状态和His补充剂的方法影响His补充剂的有效性.
在可消化的His和能量供应之间存在关键的相互作用,以使His在支持蛋白质出口方面得到最佳利用.

关键词:

奶牛牛奶牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛牛这就是histidine.这是一个元分析.牛奶生产牛奶生产

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