Incidence of different pathogens and milk compositional changes in sub-clinical and clinical milk samples of cows.

摘要

The udder of crossbred cows was screened by CMT for the detection of sub-clinical and clinical mastitis and bacteria incidence was determined. The milk samples were tested for the bacteria type and milk compositional changes viz., chloride, lactose, EC, pH and somatic cell count (SCC) was determined. Four types of bacteria incidence namely S. aureus, S. agalactiae, E. coli, E. faecalis was characterized with incidence of 30, 30, 30 and 10, and 30, 30, 10 and 20 per cent in sub-clinical and clinical milk samples. SCC varied between pathogen (P<0.05) and was significantly higher in subclinical milk samples having E. faecalis without any effect on pH and EC. However, pH, EC, Chloride and SCC in clinical mastitis samples was significantly more. It was concluded that four types of bacterial incidence occur in subclinical and clinical mastitis but their per cent incidence varied. The histo-pathological examination of clinically affected quarter indicated more tissue changes by S. agalactiae in comparison to S. aureus.