A Cross Sectional Study on the Prevalence of Sub Clinical Mastitis and Associated Risk Factors in and Aronund Gondar, Northern Ethiopia

Nibret Moges ； Yilikal Asfaw ； Kelay Belihu

《International Journal of Animal and Veterinary Advances》 3卷6期 (2011/12) Pp. 455-459

並列摘要

A cross sectional study was conducted on 322 local (n = 57) and crossbred (n = 265) lactating hand milked small holder cows in and around Gondar. The objective of the study was to determine prevalence of clinical and sub clinical mastitis and the associated risk factors by clinical examination and using california mastitis test. Bacterial culture was also conducted to determine the casual agents of mastitis. The prevalence of clinical and sub clinical mastitis in the study area was 0.93 and 31.67%, respectively with an overall prevalence of 32.6%. Out of 1288 quarters examined 164 were infected while 39 were blind. The number of clinically and sub clinically infected quarters were 7 and 157, respectively. Several pyogenic bacteria have been isolated from cases of sub clinical mastitis during the study period. The major bacteria isolated in this study were Staphylococcus aureus, Streptococcus agalactiae and Streptococcus dysgalactiae with a prevalence of 16.5, 15.9 and 14.0%, respectively. Among the risk factors considered, breed, age, parity and stage of lactation have been shown statistically significant (p＜0.05) difference in the prevalence of mastitis. Sub clinical mastitis in both breeds has been reported to be higher than clinical mastitis. The odds of occurrence of mastitis were two times more likely in crossbreds compared to local zebu. The present study disclosed that high prevalence of sub clinical mastitis and the occurrence Staphylococcus and Streptococcus spp. as dominant bacterial species from mastitic milk of the study area. All the risk factors considered were significant effect on the prevalence of mastitis. Appropriate control and prevention methods should be applied to reduce the prevalence and effect of mastitis in dairy cows.

並列關鍵字

Bacterial isolate ； clinical mastitis ； prevalence ； risk factors ； sub clinical mastitis