Etiology and sensitivity of bacterial isolates from subclinical mastitis in cows from east Vidharbha.

摘要

Milk samples from 1100 cows from farms around Nagpur were screened by the California mastitis test for the detection of subclinical mastitis; there were 228 (20.72%) positive reactions, of which 212 were also positive in culture. Single quarters were involved in 148 (69.81%) of the animals. Milk samples from 321 (98.40%) of the quarters were positive for single bacterial isolates of which most were Staphylococcus spp.; Streptococcus spp. and gram-negative bacteria were also found. The results of sensitivity tests on the isolates to 12 antibiotics are tabulated. The majority of the staphylococci and streptococci were sensitive to ciprofloxacin, and were least sensitive to amoxicillin and penicillin.