Investigation Of Morbidity And Pathogens Of Diary Cattle Mastitis In Zhengzhou, Henan Province And Drug Sensitivity Test

Mastitis in dairy cow is one of mammary gland diseases caused by pathogenic microorganism, and leads to great economic loss in dairy production.To investigate the situation of mastitis disease in suburb of Zhengzhou city, 320 milk samples from 80 cows and 320 mammary areas were examined using SMT kit and clinical signs. The results showed that average incidence of diary mastitis was 61.3%, 7.5% of cows was positive for clinical mastitis. The incidence of mastitis in outdoor herds was more than in intensive diary farms, which might be associated with feeding and milking conditions. Occurrence rate of mastitis in posterior mammary areas were more than in anterior ones. The old cows were more susceptible to pathogens of dairy mastitis than younger cows.Isolation and identification of bacteria and fungi from milk of dairy cows with clinic mastitis indicated Staphylococcus aurous, Streptococcus, Escherichia coli, Corynebacterium bovis were the main pathogens of subclinical mastitis and clinical mastitis. Fungi isolated from the clinical mastitis milk samples and subclinical mastitis milk samples are all mixed infection. Mixed infection of multiple pathogens in dairy farms was seen frequently. The results of drug sensitivity demonstrated that Staphylococcus aureus has resistance to penicillin and it's homologue, Streptococcus sp. were resistant to penicillin and Oxacillin, while most of isolated bacteria strains were sensitive to cephalosporin and Chloramphenicol drugs. Escherichia coli, Corynebacterium bovis were sensitive to most of elected drugs.