发酵参数和乳头发育在simmental生长的公牛与不同的残留料摄入量
A Romanzin1, M Braidot1, P Beraldo1
1Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Via Sondrio, 2/A, 33100 Udine, Italy.
Animal : an international journal of animal bioscience
|April 25, 2024
概括
调查西门特牛的剩余料摄入量 (RFI) 显示,较低的料效率与较高的食原和较长的乳头有关. 这些因素,以及特定的细菌,影响动物料效率,但不仅仅是决定性的.
科学领域:
- 动物科学动物科学
- 类动物营养 类动物营养
- 代谢生理学 代谢生理学
背景情况:
- 剩余料摄入量 (RFI) 是牲畜料效率的关键指标,反映了生物因素的动物间变化.
- 了解RFI背后的反动物机制对于提高动物生产效率和可持续性至关重要.
- 之前的研究表明,影响料效率的因素之间存在复杂的相互作用,需要在小动物层面进行详细的分析.
研究的目的:
- 为了研究高 (HE) 和低 (LE) 剩余料摄入量的simmental公牛的转发酵特征,微生物群组成和乳头形态.
- 为了确定在反动物层面的生物学因素,这些因素有助于各个动物之间的料效率的变化.
- 将特定的反动物参数与RFI相关联,以了解料利用的生理基础.
主要方法:
- 三十只Simmental公牛被分为HE (RFI = -1.18 ± 0.33公斤DM/d) 和LE (RFI = 0.92 ± 0.35公斤DM/d) 组.
- 在屠宰后立即和24小时体外化后,分析了鲁米纳发酵.
- 检查了乳头微生物群的组成 (使用多样性指数) 和乳头形态 (长度,密度,厚度).
主要成果:
- 与HE组相比,LE组显示出更高的酸盐度 (17.3%与16.1%) 和较低的酸盐与酸盐比率 (A:P).
- 虽然一些细菌属在不同群体之间有显著差异,但整体的α (Shannon) 和β (Bray-Curtis) 多样性保持不变.
- 低料效率 (LE) 与较长的乳头相关 (6.26毫米 vs 4.90毫米),而高料效率 (HE) 与较高的乳头密度相关 (46.4 n/cm2 vs 40.5 n/cm2).
结论:
- 酸盐生产和乳头形态是与西蒙特牛的残余料摄入相关的显著的反动因子.
- 特定的细菌属可能在料效率方面发挥作用,但它们的影响并不绝对.
- 这些发现有助于理解反动物的料效率基础,尽管需要进一步的研究来阐明决定性机制.
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