经过短暂和正常的怀孕期后,初代荷尔斯坦牛的哺乳表现
Monica Probo1, Hadi Atashi2,3, Miel Hostens4,5
1Department of Veterinary Medicine and Animal Sciences, Università degli Studi di Milano, Lodi, Italy.
Frontiers in veterinary science
|February 15, 2024
概括
在初代荷尔斯坦牛的短怀孕时间显著减少了305天的牛奶产量和峰值产量. 然而,怀孕时间较短的奶牛表现出更高的牛奶产量持久性和更低的哺乳曲线斜率.
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:
- 对牛乳开始的生理界限的了解有限.
- 孕期长度 (GL) 是影响牛繁殖和生产力的关键因素.
- 调查妊娠期缩短对哺乳期表现的影响对于乳制品管理至关重要.
研究的目的:
- 为了比较原始雌性荷尔斯坦奶牛的哺乳性能,怀孕时间短 (GL) 或堕胎,与正常GL的奶牛相比.
- 为了分析哺乳曲线的参数,包括305天的牛奶产量,峰值产量和持久性,与妊娠时间相关.
- 为了确定哺乳开始的潜在生理时间极限.
主要方法:
- 在五个欧洲国家的94个群体中使用自动化数据收集系统.
- 定义GL为最后一次授精和分娩/堕胎 (150-297天) 之间的间隔.
- 将动物分类为五个GL量级 (C-I到C-V),并使用Milkbot模型建模哺乳曲线,以估计尺度,坡道和衰变参数.
主要成果:
- 与正常GL (C-III,C-IV,C-V) 相比,GL较短的奶牛 (C-I和C-II) 的305天奶产和峰值产量明显较低.
- 在C-I和C-II组中,哺乳量明显较低,这表明牛奶产量增长较慢.
- 在C-II GL类别中的初生母牛表现出比C-IV和C-V组的母牛更高的牛奶产量持久性 (衰变).
结论:
- 原生母牛的更短的孕期与减少的整体牛奶产量和更低的峰值产量有关.
- 在经历更短怀孕期的母牛中,哺乳持续性得到增强.
- 这些发现突出了怀孕时间对哺乳动态的影响,并暗示了乳牛生殖管理的潜在影响.
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