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Journal of Dairy Science Vol. 75 No. 4 1007-1014
© 1992 by American Dairy Science Association ®
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Effects of Dry Period Length on Clinical Mastitis and Other Major Clinical Health Disorders

Carsten Enevoldsen 1 and Jan Tind Sørensen 1

1 Section of Research in Cattle Production Systems, Department of Research in Cattle and Sheep, National Institute of Animal Science Research Center Foulum, PO Box 39 DK-8830 Tjele, Denmark

Four, 7-, and 10-wk dry periods were randomly assigned to 366 dairy cows in eight herds. A multiple polytomous logistic regression analysis was conducted with the objective to reveal possible important effects of the dry period on the risk of contracting major clinical health disorders. Several complex statistical interactions were revealed. Complications around and after drying off occured least frequently at 7-wk dry periods. There was little evidence of an effect of the dry period on the risk of clinical mastitis and other severe clinical disorders around and after calving. With short calving intervals, the risk of occurrence of complications at calving decreased with the length of the dry period. This relation was reversed at longer calving intervals. Dry period lengths of approximately 7 wk appear to be associated with the lowest risk of clinical health disorders, but other factors like milk yield at drying off and previous mastitis are much more important predisposing factors.

Key Words: dry period • mastitis • health

Submitted on May 10, 1991
Accepted on October 22, 1991




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Copyright © 1992 by the American Dairy Science Association ®.