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Online Journal of Veterinary Research

Volume 24 (4):252-254, 2020.

Sub-clinical mastitis, risk factors and effects on milk quality.


Varadharajan A1 , Gnanasekar R2 , Kothandaraman S3 and Sivasakthivelan P4


123Division of Animal Husbandry, 4Department of Microbiology, Faculty of Agriculture, Annamalai University, Annamalai Nagar - 608002, Tamil Nadu, India.



Varadharajan A, Gnanasekar R, Kothandaraman S, Sivasakthivelan P., Sub-clinical mastitis, risk factors and effects on milk quality, Onl J Vet Res., 24 (4):252-256, 2020. We describe characteristics of subclinical mastitis milk in dairy cows from 10 villages in Tamil Nadu, India over a 12 month period. We found a prevalence of 38% over 12 months for sub clinical mastitis in 76/200 cows tested. Of 800 quarters 186 or 23% were positive with right 22% and left front 28%, right 22 and left hind 28%. Compared with normal controls, in cows with mastitis we found higher (p < 0.05) milk pH (~5%) and ~18% lower fat content. We also found reduced protein (~11%) but no differences with solid non fat. We found higher (P < 0.05) incidence of subclinical mastitis in older cows and those with more frequent lactations but no effect of stage of lactation, method of milking or housing.


Keywords: Prevalence, Subclinical mastitis, Physico-chemical Properties, Risk factors,