饮食脂肪来源和度对奶牛料摄入量,肠道甲和牛奶产量的影响
Giulio Giagnoni1, Peter Lund1, Marianne Johansen1
1Department of Animal and Veterinary Sciences, AU Viborg - Research Centre Foulum, Aarhus University, DK 8830 Tjele, Denmark.
Journal of dairy science
|October 30, 2024
概括
将食脂肪添加到奶牛料中可以降低甲排放. 油菜油脂增加了牛奶产量高达5.7%的原油,而棕核脂肪减少了它,这表明脂肪来源对减少甲的策略很重要.
科学领域:
- 动物科学动物科学
- 农业科学 农业科学
- 环境科学 环境科学
背景情况:
- 在奶牛配给中加入食脂肪可以减轻肠道甲 (CH4) 排放.
- 有限的研究探索不同脂肪来源的不同度,以减少CH4.
研究的目的:
- 研究不同度的麻 (RS) 和棕谷 (PK) 脂肪酸对乳牛肠道甲产量,料摄入量和牛奶产量的影响.
主要方法:
- 使用48头母牛的6x6拉丁方形设计,评估六种治疗方法:对照,三种RS脂肪度和两种PK脂肪度 (3-7%原油脂肪).
- 使用GreenFeed单位测量了甲的产量.
- 记录了料摄入量,消化能力 (OM,NDF),牛奶产量和能量校正牛奶 (ECM).
主要成果:
- RS和PK脂肪都减少了干物质摄入量 (DMI),中等PK度的减少更大.
- 有机物消化能力在低脂肪度时最高,在高RS时最低.
- 收获高达5.7%原油脂肪的菜补充剂增加了牛奶和ECM产量; PK降低了ECM.
- 甲产量 (g CH4/kg DMI) 与RS线性下降,与PK线性下降.
- 中等PK降低了CH4产量超过中等RS,但CH4强度 (g CH4/kg ECM) 没有受到影响.
结论:
- 饮食脂肪来源显著影响奶牛的表现和甲减排效率.
- 棕核脂肪显示出更强的甲减排效应,但却对牛奶生产产生了负面影响,使菜成为平衡甲减排和生产率的更有利选择.
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