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2004Schnier C; Hielm S; Saloniemi H S
Comparison of the breeding performance of cows in cold and warm loose-housing systems in Finland.
Preventive veterinary medicine 2004;62(2):135-51.
Finland's cold loose-housing systems for dairy cows were compared with the more traditional warm loose-housing systems regarding the number of days from calving-to-first-service, the first-service-pregnancy risk and the repeated-service-conception hazard. 3131 calvings registered during the indoor periods in 1996 and 1997 on 208 farms were modelled using multilevel survival analysis and logistic regression in a retrospective cohort study. Compared to cows in a warm loose-housing system, cows in a cold loose-housing system had the same period from calving-to-first-service, a significant 6% lower first-service-pregnancy risk and the same repeated-service-conception hazard.

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