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Báo cáo khoa học: " Direct and indirect measurement of somatic cell count as indicator of intramammary infection in dairy goats"

Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú yđề tài: Direct and indirect measurement of somatic cell count as indicator of intramammary infection in dairy goats. | Persson and Olofsson Acta Veterinaria Scandinavica 2011 53 15 http www.actavetscand.eom content 53 1 15 AVS ACTAVETERINARIA SCANDINAVICA RESEARCH Open Access Direct and indirect measurement of somatic cell count as indicator of intramammary infection in dairy goats Ylva Persson1 Ida Olofsson2 Abstract Background Mastitis is the most important and costly disease in dairy goat production. Subclinical mastitis is common in goats and is mainly caused by contagious bacteria. Several methods to diagnose subclinical mastitis are available. In this study indirect measurement of somatic cell count SCC by California Mastitis Test CMT and direct measurement of SCC using a portable deLaval cell counter DCC are evaluated. Swedish goat farmers would primarily benefit from diagnostic methods that can be used at the farm. The purpose of the study was to evaluate SCC measured by CMT and DCC as possible markers for intramammary infection IMI in goats without clinical symptoms of mastitis. Moreover to see how well indirect measurement of SCC CMT corresponded to direct measurement of SCC DCC . Method Udder half milk samples were collected once from dairy goats n 111 in five different farms in Northern and Central Sweden. Only clinically healthy animals were included in the study. All goats were in mid to late lactation at sampling. Milk samples were analyzed for SCC by CMT and DCC at the farm and for bacterial growth at the laboratory. Results Intramammary infection defined as growth of udder pathogens was found in 39 18 of the milk samples. No growth was found in 180 81 samples while 3 1 samples were contaminated. The most frequently isolated bacterial species was coagulase negative staphylococci CNS 72 of all isolates followed by Staphylococcus aureus 23 of all isolates . Somatic cell count measured by DCC was strongly p 0.000 associated with bacterial growth. There was also a very strong association between CMT and bacterial growth. CMT 1 was associated with freedom of IMI while .