相关实验视频
Updated: May 28, 2025

04:41
Measuring Lactase Enzymatic Activity in the Teaching Lab
Published on: August 6, 2018
113.2K
乳牛生产乳糖的变化来源
J I Gargiulo1, S C Garcia2, R C Hovey3
1New South Wales Department of Primary Industries and Regional Development, Menangle, NSW 2568, Australia.
Journal of dairy science
|February 13, 2025
概括
奶牛在乳糖生产中表现出显著的变化,受品种和环境的影响. 选择性育种可以优化牛奶成分并减少体积,提高效率并可能降低环境影响.
科学领域:
- 动物科学动物科学
- 乳制品科学 乳制品科学
- 遗传学 是一个遗传学.
背景情况:
- 乳糖是牛奶的关键成分,但其产量在奶牛之间有很大差异.
- 了解影响乳糖合成的因素对于提高乳制品生产效率和可持续性至关重要.
研究的目的:
- 为了研究乳牛乳糖产量的变化.
- 确定影响乳糖产量 (LY),乳糖百分比 (LP) 和牛奶固体产量 (MSY) 的因素.
- 探索选择性育种调节乳糖合成的潜力.
主要方法:
- 来自澳大利亚新南威尔士州 (2008-2022) 的大量数据集 (393,772条记录,85个群体) 的分析.
- 包括群体测试数据,气象数据和乳母遗传信息.
- 对牛奶产量,成分,生殖数据,品种和环境因素的统计分析.
主要成果:
- 在品种,平价和哺乳阶段观察到LY,LP和MSY的显著变化.
- 霍尔斯坦的LY和MSY较高,但LP较低;杰西的MSY:LY比率较高.
- 在LY和牛奶成分 (脂肪,蛋白质) 和环境因素 (温度-湿度指数) 之间发现了负相关性.
- 对LY,LP和MSY:LY的遗传概率估计在0.24至0.33之间,表明基因影响中等.
结论:
- 乳糖生产受到遗传,环境和管理因素的结合的影响.
- 针对较低的LP或较高的MSY:LY比率的选择性育种策略可以提高牛奶成分生产并减少牛奶量.
- 调节乳糖合成提供了一条改善乳牛生产效率和潜在减轻环境影响的途径.
相关概念视频
Operons
48.5K
Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
48.5K
Genetic Variation
256
Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
Genes exist in different versions called alleles,...
256
Punnett Squares
112.1K
Overview
112.1K

