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怀孕后几天与乳牛的哺乳持续时间之间的关联

Y Chen¹, W Steeneveld¹, K Frankena²

¹Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht, the Netherlands.

Journal of dairy science

|April 5, 2024

概括

怀孕降低了母牛的哺乳持续性,其影响因受孕后的几天和受孕时的牛奶几天而异. 晚期发育通常会导致更高的持续性,有助于农民的决策.

科学领域:

乳制品科学乳制品科学
动物繁殖动物繁殖
哺乳期生理学哺乳期生理学

背景情况:

对奶牛来说,最佳的授精时间至关重要,平衡怀孕影响与牛奶产量.
有限的定量数据存在于怀孕期间乳房持久性的变化,相对于怀孕时在牛奶中的天数 (DIMc).

研究的目的:

为了研究怀孕后几天 (DPC) 和哺乳持续时间之间的关联.
为了确定怀孕期间哺乳持续性如何变化.
评估受孕时在牛奶中的几天 (DIMc) 对这种关系的影响.

主要方法:

分析了来自荷兰和比利时87个牛群的23,908头母牛的乳生产数据 (2005-2022年).
使用哺乳曲线衰变模型测量哺乳持续性,计算在8个DPC阶段 (0-210天).
使用DPC,DIMc,平价及其相互作用作为关键变量进行回归分析.

主要成果:

哺乳持续性在怀孕期间降低了原生母牛和多生母牛.
与原生雌牛相比,多雌牛在DPC 150和210之间表现出更显著的持续性下降.
在哺乳期晚些时候怀孕 (更高的DIMc) 与更大的哺乳持续性有关,尽管DIMc对妊娠期间的持续性变化的影响很小,除了早期DIMc组.

结论:

怀孕对哺乳持续性产生负面影响,基于DPC和平价的独特模式.
DIMc影响整体持久性水平,但对妊娠期间的变化 * 速率 * 有有限的影响.
这些发现支持通过整合哺乳持续性见解来改进生殖管理策略.

关键词:

乳制品乳制品是一种乳制品.怀孕时在牛奶中的几天.怀孕后几天怀孕后几天哺乳持续性哺乳持续性

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