the study of the prevalence of Staphylococcus aureus caused by clinical swelling and determination of antibiotic susceptibility to dairy cattle in eyvan County

Background and Aim : Inflammation of the breast or inflammation of the mammary gland is one of the most important diseases in lactating cows, the economic losses of which are significant. There are several factors involved in the development of diseases in lactating cows, such as mastitis, the most important of which are staphylococcal agents. Due to the prevalence of diseases in lactating cows and antibiotic resistance, the aim of this study was to isolate staphylococcal disease agents, determine their susceptibility and antibiotic resistance.Methods : For this purpose, milk samples were prepared from ۱۰۰ heads of Holstein dairy cows belonging to cattle farms around Ivan city in Ilam province, and after C.M.T experiment, the infected samples were cultured bacterially and staphylococcal agents were isolated. Antiseptic and resistance factors of Staphylococcus aureus were then determined using mast antibiotic disks.Results : The results showed that out of ۱۰۰ cows, ۳۰ had subclinical mastitis and ۱ had clinical form, of which ۳۰ were subclinical, ۹ were staphylococcal (۶ specimens of urea). The results of a sensitivity test for some antibiotics showed that ۹۲% of the Staphylococcus aureus isolated from the subclinical form were sensitive to erythroloxacin, ۶۸% to trietometopyrim, ۶۵% to gentamicin, ۶۱% to lincospectin and ۳۲% to oxytocrysycin And ۲۰% were semi-sensitive to amoxicillin. No susceptibility to penicillin and ampicillin antibiotics was observed.Conclusion : According to the results of this study, staphylococci were the most pathogenic cause of mastitis in the samples of cow's milk tested, and the antibiotic erofluoxacin and trimethoprim had the greatest effect on inhibiting the growth of staphylococci in the study area. Therefore, it is recommended that erofloxacin and trimethoprim antibiotics be used to treat breast uremia.

کلیدواژه ها:

Inflammation of the breast ، staphylococcus ، antibiotic susceptibility