tailieunhanh - Báo cáo khoa học: "Prevalence of Anaplasma phagocytophilum infection and effect on lamb growt"

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: Prevalence of Anaplasma phagocytophilum infection and effect on lamb growth. | Gr0va et al. Acta Veterinaria Scandinavica 2011 53 30 http content 53 1 30 AVS ACTAVETERINARIA SCANDINAVICA RESEARCH Open Access Prevalence of Anaplasma phagocytophilum infection and effect on lamb growth Lise Gr0va1 2 Ingrid Olesen2 3 Havard Steinshamn1 and Snorre Stuen4 Abstract Background A major challenge in sheep farming during the grazing season along the coast of south-western Norway is tick-borne fever TBF caused by the bacteria Anaplasma phagocytophilum that is transmitted by the tick Ixodes ricinus. Methods A study was carried out in 2007 and 2008 to examine the prevalence of A. phagocytophilum infection and effect on weaning weight in lambs. The study included 1208 lambs from farms in Sunndal Ram Circle in M0re and Romsdal County in Mid-Norway where ticks are frequently observed. All lambs were blood sampled and serum was analyzed by an indirect fluorescent antibody assay IFA to determine an antibody status positive or negative to A. phagocytophilum infection. Weight and weight gain and possible effect of infection were analyzed using ANOVA and the MIXED procedure in SAS. Results The overall prevalence of infection with A. phagocytophilum was 55 . A lower weaning weight of 3 kg p was estimated in lambs seropositive to an A. phagocytophilum infection compared to seronegative lambs at an average age of 137 days. Conclusions The results show that A. phagocytophilum infection has an effect on lamb weight gain. The study also support previous findings that A. phagocytophilum infection is widespread in areas where ticks are prevalent even in flocks treated prophylactic with acaricides. Background Tick-borne fever TBF is one of the main challenges in Norwegian sheep farming during the grazing season 1 . TBF is caused by the bacteria Anaplasma phagocytophi-lum transmitted by the tick Ixodes ricinus and may cause direct lamb deaths and indirect loss reduced growth in sheep farming. The normal distribution area of I. ricinus ticks in

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