University of Tehran Iranian Journal of Veterinary Medicine 2251-8894 8 4 2015 01 01 The evaluation of udder health status in Holstein dairy farms located in Qom province ارزیابی وضعیت سلامت پستان در مزارع گاو شیری هلشتاین واقع در استان قم 255 260 52484 10.22059/ijvm.2015.52484 EN Tayebeh Mahmoodi Afsah Department of Theriogenology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran Mehdi Vojgani Department of Theriogenology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran Faramarz Gharagozlou Department of Theriogenology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran Vahid Akbarinejad Young Researchers and Elites Club, North Tehran Branch, Islamic Azad University, Tehran, Iran Journal Article 2014 04 15 BACKGROUND:Mastitis is the most economically important disease in dairy industry worldwide. Bulk tank milk (BTM) analysis has been suggested for monitoring the udder health status at herd level. OBJECTIVES: A cross-sectional study was conducted to evaluate udder health status in 15 Holstein dairy farms located in Qom province. METHODS: Bulk tank somatic cell count (BTMSCC) was analyzed using opto-fluoroelectronic counter. Standard plate count, preliminary incubation count, laboratory pasteurized count, and the number of environmental streptococci, S. agalactiae, S. dysgalactiae, S. uberis, E. coli, K. pneumoniae, coagulase negative streptococci, S. aureus and C. bovis were determined using specific culture media. Moreover, clinical and subclinical mastitis were diagnosed using physical examination and California mastitis test, respectively. RESULTS: Most herds had moderate to high BTMSCC and high bacterial counts. The prevalence of clinical and subclinical mastitis was 1.3% and 24.7%, respectively. CONCLUSIONS: The present study indicated inefficient stall management, udder hygiene, and milking practices in the herds investigated.

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