Journal
FRONTIERS IN VETERINARY SCIENCE
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fvets.2022.885134
Keywords
bacterial isolates; milk quality; somatic cell count; toxic genes; mastitis
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Funding
- Department of Biotechnology, Government of India, New Delhi, India [BT/PR21547/NNT/28/1232/2017]
- National Research Foundation, Republic of Korea [2017R1A2B2012125]
- National Research Foundation of Korea [2017R1A2B2012125] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Mastitis is a complex disease that negatively affects the quality and quantity of milk in dairy cows. Staphylococcus aureus and Escherichia coli are the main pathogens involved in mastitis, along with other environmental pathogens. The somatic cell count is directly related to the severity of mastitis and has a significant negative correlation with fat, lactose, solid not fat (SNF), and ash in milk.
Mastitis is a multi-etiological complex disease of dairy cows and negatively affects the quality and quantity of milk. Milk is a nutritious food for human being; milk quality is negatively affected by intramammary infection of dairy cows. A total of 300 milk samples were collected from mastitis dairy cows irrespective of parity and stage of lactation, 235 (78.33%) samples were culturally positive and yielded 1,100 bacterial isolates. Staphylococcus aureus was found to be the prime etiological agent involved in the mastitis of dairy cows, followed by Escherichia coli and other environmental pathogens. On the molecular characterization of isolates obtained from the milk culture, various toxic genes such as nuc, seb, hla, stx1, stx2, hly, and Sagl were found on different isolated bacteria. Milk somatic cell counts (SCC) were found to be directly related to the severity of mastitis. On drawing the SCC correlation with milk components, it was found that SCC had a significant negative correlation with fat, lactose, solid not fat (SNF), and ash. It was concluded that mastitis-affected milk contains numerous pathogenic bacteria, toxins, and reduced milk quality, which is unfit for human consumption.
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