Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (8): 3659-3668.doi: 10.11843/j.issn.0366-6964.2024.08.037

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Study on the Community Structure of Psychrophilic Bacteria in Raw Milk from North Regions of China based on Metagenomic Sequencing

Wenjun XU1,2,3(), Nan ZHENG2,3, Jiaqi WANG2,3, Lu MENG2,3,*()   

  1. 1. College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
    2. Key Laboratory of Quality and Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
    3. Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs (Beijing), Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2023-11-15 Online:2024-08-23 Published:2024-08-28
  • Contact: Lu MENG E-mail:xubj2022@163.com;menglu@caas.cn

Abstract:

The aim of this study was to investigate the community structure diversity of psychrophilic bacteria in raw milk in northern China by metagenomic sequencing. A total of 14 raw milk samples were collected from 14 pastures in Inner Mongolia and Beijing, China in winter. The culturable psychrophilic bacteria were isolated and purified, total microbial DNA in raw milk was extracted as well. Moreover, the psychrophilic bacteria in raw milk were analyzed by 16S rDNA sequencing and metagenomic sequencing, respectively. The results showed that no significant difference was found in community structure of psychrophilic bacteria in raw milk between Beijing and Inner Mongolia. Pseudomonas, Stenotrophomonas and Brevundimonas were the dominant psychrophiles bacteria in raw milk from the two regions. The global and overview profiles, amino acid metabolism and carbohydrate metabolism were the most important functional metabolic pathways, and psychrophilic bacteria contained a variety of antibiotic resistance genes. In conclusion, this study used traditional culture and metagenomic sequencing to accurately determine the species and functional information of the psychrophilic community in raw milk, which is helpful to understand the life activities of psychrophilic bacteria in raw milk and provide basic information for risk assessment of psychrophilic bacteria. Furthermore, it lays down foundational knowledge pivotal for the effective prevention and management of pasture-related issues in Beijing and Inner Mongolia, China.

Key words: raw milk, psychrophilic bacteria, metagenomic sequencing, region, structure

CLC Number: