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Báo cáo khoa học: "Occurrence of Clinical and Sub-Clinical Mastitis in Dairy Herds in the West Littoral Region in Uruguay"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Occurrence of Clinical and Sub-Clinical Mastitis in Dairy Herds in the West Littoral Region in Uruguay. | Acta vet. scand. 2002 43 221-230. Occurrence of Clinical and Sub-Clinical Mastitis in Dairy Herds in the West Littoral Region in Uruguay By R. Gianneechini1-3 C. Concha2 R. Rivero3 I. Delucci4 and J. Moreno Lopez1 department of Microbiology Faculty of Veterinary Medicine Swedish University of Agricultural Sciences department of Mastitis and Diagnostical Products National Veterinary Institute Uppsala Sweden daboratory Veterinary Direction Miguel C. Rubino Paysandú and National Research Agriculture Institute INIA Colonia Uruguay. Gianneechini R Concha C Rivero R Delucci I Moreno Lopez J Occurrence of clinical and sub-clinical mastitis in dairy herds in the west littoral region in Uruguay. Acta vet. scand. 2002 43 221-230. - Twenty-nine dairy farms were selected to determine the incidence of clinical mastitis prevalence of sub-clinical mastitis and bacterial aetiology in the West Littoral Region of Uruguay. In samples taken by the owner and frozen at -20 C during a week the incidence rate of clinical mastitis was determined as 1.2 cases per 100 cow-months at risk. Staphylococcus aureus was the most common isolated pathogen in 37.5 of 40 milk samples from clinical cases obtained in 1 month. No bacteria grew in the 32.5 of the total samples. A sub-sample including 1077 dairy cows from randomly selected farms was used to determine the prevalence of sub-clinical mastitis. These samples were taken on one visit to each farm. The prevalence was 52.4 on a cow basis and 26.7 on an udder quarter basis. In 55.1 of the quarters of the selected animals with more than 300 000 cells ml there was no growth. The isolated pathogens from sub-clinical cases and their relative frequencies were Staphylococcus aureus 62.8 Streptococcus agalactiae 11.3 Enterococcus sp. 8 coagulase-negative staphylococci 7.4 Streptococus uberis 6.4 Streptococcus dysgalactiae 1.8 Escherichia coli 1.5 and Staphylococcus hyicus coagulase-positive 0.6 . mastitis Uruguay cows incidence prevalence. Introduction .