Abstract

Mastitis is the most complex and costly disease of dairy cows occurring throughout the world including Ethiopia Streptococcal mastitis is the commonest and economically important However mastitis caused by this species is not well investigated A cross-sectional study was conducted from November 2016 to April 2017 to determine the prevalence of mastitis associated risk factor and also to isolate pathogenic streptococcus species from lactating dairy cows in and around Haramaya town Eastern Ethiopia A total of 384 milking cows and 1536 quarters were examined out of which 189 and 677were CMT positive at cow and quarter level respectively The overall prevalence 49 2 189 384 at cow level and 45 68 at quarter level were determined respectively Out this 7 5 29 384 were clinical mastitis and 41 7 160 384 were subclinical and 6 8 clinical and 38 86 sub-clinical were found to be mastitis positive on CMT at cows and quarter level respectively Among total of 1536 quarters examined 54 3 5 had blind teats The age lactation stage parity and hygienic milking practice were found to have significant p 0 05 influence on the occurrence of mastitis The prevalence was relatively higher in old than adult and young in earlier and late lactation stage than mid lactation stage in cows with many calves than those with moderate and few calves as well as not wash pre and post milking udder than pre milking and wash pre and post milking udder However there was no statistically significant difference p 0 05 among the risk factors breed and address of animals 127CMT positive cows sample were bacteriological examination Out of 127 samples taken 49 38 58 samples were positive for isolation of streptococcus species with 21 16 5 Streptococcus agalactiae 15 11 8 Streptococcus uberis and 13 10 2 Streptoccocus dysgalactiae were identified The study showed that mastitis is an important problem and a serious threat for dairy industry in the study