TY - JOUR ID - 1767 TI - Prevalence and antimicrobial susceptibilities of coagulasenegative Staphylococci isolated from mammary secretions in pregnant Holstein heifers JO - Iranian Journal of Veterinary Research JA - IJVR LA - en SN - 1728-1997 AU - Ataee, O. AU - Hovareshti, P. AU - Bolourchi, M. AU - Niasari-Naslaji, A. AU - Barin, A. AD - Department of Clinical Sciences, Faculty of Veterinary Medicine, Islamic Azad University of Karadj, Karadj, Iran AD - Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran Y1 - 2007 PY - 2007 VL - 8 IS - 3 SP - 270 EP - 274 KW - Heifer mastitis KW - Coagulase-negative Staphylococci KW - antibiotic susceptibility DO - 10.22099/ijvr.2007.1767 N2 - Mammary secretions of 913 quarters from 229 pregnant Holstein heifers were obtained aseptically to determine the prevalence of coagulase-negative Staphylococci isolated during periparturient period. Quarter samples were collected 14 to 10 days before expected parturition. Analysis of culture data indicated that 78.5% (717/913) of samples were negative, 20.5% (187/913) contained coagulase-negative Staphylococci, 0.33% coagulase-positive Staphylococci, 0.33% E. coli, 0.22% Arcanobacterium pyogenes and 0.11% environmental Streptococci spp. A total of 187 isolates of coagulase-negative Staphylococci were tested in vitro for susceptibility to 8 antimicrobial agents. Susceptibility was detected in 180 (96.3%), 187 (100%), 163 (87.2%), 168 (89.8%), 183 (97.9%), 187 (100%), 174 (93%) and 164 (87.7%) isolates for oxytetracycline, gentamicin, streptomycin, tylosin, cloxacillin, enrofluxacin, trimethoprim+ sulphamethoxazole and penicillin G, respectively. More than 93.8% of the isolates were susceptible to all antimicrobial agents tested. In conclusion, results of this study suggest that coagulase-negative Staphylococci spp. is the most prevalent microorganism isolated from intramammary secretions in pregnant heifers which issusceptible to common antibiotics in vitro.   UR - https://ijvr.shirazu.ac.ir/article_1767.html L1 - https://ijvr.shirazu.ac.ir/article_1767_d2aaba9e77058e64e5ade585430661f3.pdf ER -