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2002:
Schnier C; Hielm S; Saloniemi H S
Comparison of the disease incidences of dairy cows kept in cold and warm loose-housing systems.
Preventive veterinary medicine 2002;
53(
4):.
Finland's cold loose-housing systems for dairy cows were compared with the more traditional warm loose-housing systems regarding the incidences of ketosis, mastitis, metritis, parturient paresis and ovarian disorders. Approximately 5000 calvings on 210 farms during the years 1996 and 1997 were modelled, using multilevel Poisson regression and multilevel logistic-regression in a retrospective observational cohort study. Cows in a cold loose-housing system were at lower odds for developing late mastitis (15-305 days in milk), and metritis (Friesian breed); of the same odds for ketosis and early mastitis (0-14 days in milk); but at higher odds for developing parturient paresis and metritis (Ayrshire breed). The estimated odds ratio for ovarian disorders depended on the definition for exposure. Although one of the differences was statistically significant and many of them of veterinary interest, none of them appear to be substantial for the economy of a median-sized dairy farm in Finland.
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