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Comparison of milk production of dairy cows kept in cold and warm loose-housing systems |
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| Authors: | Schnier C Hielm S Saloniemi H S |
| Institution: | a Section of Animal Hygiene, Department of Clinical Veterinary Sciences, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 57, FIN 00014, Helsinki, Finland b Ministry of Social Affairs and Health, P.O. Box 33, FIN 00023 Government, Finland |
| Abstract: | A retrospective cohort study was conducted to test whether the lactation curves of cows kept in cold loose-housing systems (CLHs) were the same as for cows in warm loose-housing systems (WLHs) in the Nordic countries. Approximately 40 000 test-day records from 5366 Ayrshire or Black and White cows kept on 38 CLHs and 166 WLHs in Finland during 1996 and 1997 were used. Analysis used a random-coefficient model (correcting for parity, breed and calving-year-season and the correlation-structure between test-days of the same cow and cows of the same herd). Cows in a CLH produced up to 1 l less milk per test-day, but this difference was not statistically significant. Surprisingly, the difference in milk yield was not affected by calving-year-season, parity or breed. |
| Keywords: | Micro-climate Housing Milk yield Random-coefficient model |
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