相关实验视频

Updated: Jun 24, 2025

Metagenomic Analysis of Silage

Metagenomic Analysis of Silage

Published on: January 13, 2017

从季度收获的牛奶中存在病原体DNA与牛奶产量和成分的变化有关

Silvia Magro¹, Elena Visentin¹, Angela Costa²

¹Department of Agronomy, Food, Natural resources, Animals and Environment, University of Padova, Legnaro, 35020, Italy.

BMC veterinary research

|June 7, 2024

概括

通过定量PCR (qPCR) 检测到的乳牛的亚临床乳腺内感染会对牛奶产量和质量产生负面影响. 早期检测和有针对性的治疗对于管理乳健康和优化抗菌药物使用至关重要.

科学领域:

兽医医学兽医医学兽医医学
动物科学动物科学
乳制品生产乳制品生产

背景情况:

乳腺内感染导致乳腺炎,是奶牛养殖,特别是亚临床形式的重大经济和健康挑战.
尽管努力改善乳健康状况,但亚临床乳腺炎仍然普遍存在,影响牛奶质量和产量.

研究的目的:

使用定量PCR (qPCR) 来检测临床健康奶牛的牛奶中的病原体.
评估受感染区数量和特定微生物对牛奶特征的影响.
评估亚临床感染与牛奶质量参数之间的关系.

主要方法:

从临床上健康的不同品种的奶牛 (荷尔斯坦,西蒙特尔,伦德纳,泽西) 采集了四分之一牛奶样本.
商用qPCR套件被用于检测一组常见的乳腺炎引起的病原体.
牛奶的体细胞数量,素指数,乳糖含量和牛奶产量都与病原体检测和感染季度数量相关分析.

主要成果:

凝聚酶阴性葡萄球菌 (CNS) 是最频繁检测到的DNA,其次是Streptococcus uberis,Mycoplasma bovis和Streptococcus agalactiae.
有病原体在四分之三或更多的奶牛表现出最高的体细胞计数和最低的素指数和乳糖含量.
亚临床感染显著损害了牛奶产量和主要的牛奶固体,无论是否确定了主要或小的病原体.

结论:

亚临床炎,即使在临床上健康的奶牛中,也会对牛奶产量和质量产生重大负面影响.
建议对牛奶进行定量PCR (qPCR) 分析,以确定高风险区域,使得针对性抗菌治疗成为可能,特别是在干燥牛群中.
需要进一步的研究来调查可能对奶牛构成风险的非向微生物.

关键词:

乳内感染乳内感染无菌牛奶采样无菌牛奶采样阴茎健康问题阴茎健康问题 qPCRR 是一个很好的方法.

更多相关视频

Bovine Mammary Gland Biopsy Techniques

Bovine Mammary Gland Biopsy Techniques

Published on: December 23, 2018

A Method for Targeted 16S Sequencing of Human Milk Samples

A Method for Targeted 16S Sequencing of Human Milk Samples

Published on: March 23, 2018

相关概念视频

Defense Against Bacterial Pathogens

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...

Infection

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...

The Central Dogma

The Central Dogma

The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...

Genomic DNA in Prokaryotes

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...