相关实验视频

Updated: Jun 25, 2025

Author Spotlight: Evaluating the Impact of Immediate Partial Removal of Cumulus-Oocyte Complexes on Fertilization Efficiency and Embryo Quality

Author Spotlight: Evaluating the Impact of Immediate Partial Removal of Cumulus-Oocyte Complexes on Fertilization Efficiency and Embryo Quality

Published on: October 18, 2024

对比接触时间对牛和小牛在分离后的表现的影响 - - 一项前性队列研究

Johanne Sørby¹, Ingrid Hunter Holmøy², Ane Nødtvedt²

¹Department of Animal and Aquacultural Sciences, Faculty of Biosciences, Norwegian University of Life Sciences, Oluf Thesens vei 6, Ås, 1433, Norway. johanne.sorby@nmbu.no.

Acta veterinaria Scandinavica

|May 22, 2024

概括

牛与小牛的接触 (CCC) 并没有对机器奶产量或分离后小牛的平均日益 (ADG) 产生负面影响. 需要进一步的多群体研究来了解CCC对乳牛和小牛分离后表现的影响.

科学领域:

乳制品科学乳制品科学
动物养殖动物养殖
可持续农业可持续农业

背景情况:

越来越多的人对奶牛和小牛接触 (CCC) 感兴趣,以实现可持续的奶牛养殖.
关于哺乳期以外的CCC影响存在知识差距.
需要对CCC影响进行多群观察性研究.

研究的目的:

研究CCC在牛和小牛分离后对机器牛奶产量和小牛生长的群体内影响.
分析不同接触时间的CCC对挪威红牛和小牛的影响.
评估分离后的绩效指标,牛分离后最长305天,小牛分离后最长6个月.

主要方法:

挪威三家乳制品农场的前性队列研究.
将CCC分类为没有接触 (0-3天),短持续时间 (4-30天) 和长持续时间 (>30天).
利用线性混合模型分析机器奶产量和小牛的平均每日增益 (ADG).

主要成果:

在分离后,CCC组之间没有观察到机器牛奶产量的显著差异.
小牛的平均每日增益 (ADG) 在不同CCC暴露时间之间没有差异.
无论是母牛还是小牛,无论分离后母牛与小牛接触的时间长短,表现都相似.

结论:

牛与小牛接触 (CCC) 似乎不会对机器奶产量或分离后小牛生长产生负面影响.
研究结果表明,CCC与乳制品生产绩效指标兼容.
建议在农场进行更多的多群体研究,以充分了解CCC对奶牛和小牛的长期影响.

关键词:

牛犊生长的增长情况建设大的工程牛奶产量牛奶产量断奶后的时间.

更多相关视频

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Published on: August 8, 2017

Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit

Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit

Published on: December 16, 2015

相关概念视频

Longitudinal Research

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...

Observational Studies

Observational Studies

Observational studies are a type of analytical study where researchers observe events without any interventions. In other words, the researcher does not influence the response variable or the experiment's outcome.
There are three types of observational studies – Prospective, retrospective, and cross-sectional.
Prospective Study
Prospective studies, also known as longitudinal or cohort studies, are carried out by collecting future data from groups sharing similar characteristics. One...

Longitudinal Studies

Longitudinal Studies

Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...

Cross-Sectional Research

Cross-Sectional Research

In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...