与荷尔斯坦乳牛的甲排放相关的表型特征受到低或高料比例的挑战
Maria H Kjeldsen1, Trinidad de Evan Rozada1, Samantha J Noel1
1Department of Animal and Veterinary Sciences, AU Viborg-Research Centre Foulum, Aarhus University, 8830 DK Tjele, Denmark.
Journal of dairy science
|September 8, 2024
概括
为了减少肠道甲 (CH4) 排放,养殖奶牛可能会降低它们消化有机物 (OM) 的能力. 需要进一步的研究来确认OM消化能力和牛的CH4产量之间的关系.
科学领域:
- 动物科学动物科学
- 营养生物化学 营养生物化学
- 环境科学 环境科学
背景情况:
- 有限的数据存在于与乳牛肠道甲 (CH4) 生产相关的表型特征.
- 了解这些特征对于旨在减少CH4产量 (每千克干物质摄入量) 和其对环境的影响的育种计划至关重要.
研究的目的:
- 研究乳牛中CH4产量与各种动物表型之间的关系.
- 确定选择具有较低CH4产量的奶牛的潜在指标.
主要方法:
- 在交叉设计中使用了16只第二平价奶牛,两种饮食在料比例上有所不同 (35% vs 63% DM).
- 测量包括间接热量测量气体交换,便分析可消化性,反参数 (VFA,甲丰度,传递率) 和活动.
- 统计分析涉及线性混合模型和皮尔森对随机牛估计的CH4产量和其他测量变量之间的相关性.
主要成果:
- 在CH4产量和有机物质 (OM) 消化能力之间发现了显著的正相关性 (r = 0.63).
- CH4的产量也与酸 (r = 0.54) 和氨 (r = 0.55),以及酸 (r = -0.61) 和乳酸 (r = -0.53) 的反血度相关.
- 养较高料饮食的奶牛 (63% DM) 呈现出更高的NDF消化率,CH4排放量和更长的乳头保留时间.
结论:
- 乳牛的OM消化能力与它们的肠道CH4排放之间存在积极的关联.
- 为减少CH4排放而进行的繁殖可能会无意中导致奶牛OM消化能力下降.
- 进一步的研究是必要的,以验证这些发现,并了解对育种策略的影响.
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