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: Characterisation of the Repeat Breeding Syndrome in Swedish Dairy Cattle. | Acta vet. scand. 2002 43 115-125. Characterisation of the Repeat Breeding Syndrome in Swedish Dairy Cattle By H. Gustafsson1 and U. Emanuelson2 1Swedish Dairy Association Eskilstuna 2Department of Animal Breeding and Genetics Swedish University of Agricultural Sciences Uppsala Sweden. Gustafsson H Emanuelson U Characterisation of the repeat breeding syndrome in swedish dairy cattle. Acta vet. scand. 2002 43 115-125. - Repeat breeding RB defined as cows failure to conceive from 3 or more regularly spaced services in the absence of detectable abnormalities is a costly problem for the dairy producer. To elucidate the occurrence of RB in Swedish dairy herds and to identify risk factors of the syndrome totally 57 616 dairy cows in 1 541 herds were investigated based on data from the official Swedish production- AI- and disease- recording schemes. The characteristics of the RB syndrome were studied on both herd and individual cow level. The effects of risk factors on the herd frequency of RB were studied by logistic regression. A generalised linear mixed model with logit link and accounting for herd-level variation by including a random effect of herd was used to study the individual animal risk for RB. The total percentage of RB animals was and the median proportion of RB animals in the herds studied was . The proportion of RB cows in herds increased with decreased herd sizes with decreased average days from calving to first AI with increased herd incidence of clinical mastitis with decreased reproductive disorders and increased other diseases treated by a veterinarian. On animal level the risk factors were milk yield lactation number difficult calving or dystocia season at first service days in milk at first service and veterinary treatment for reproductive disorders before the first service. Cows being an RB animal in the previous lactation had a higher risk of becoming an RB animal also in the present lactation. In conclusion our results show that the repeat
