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Journal of Dairy Science Vol. 78 No. 8 1693-1702
© 1995 by American Dairy Science Association ®
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The Association Between Previous 305-day Milk Yield and Disease in New York State Dairy Cows

Y. T. Gröhn 1, S. W. Eicker 1, and J. A. Hertl 1

1 Section of Epidemiology, Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853

Logistic regression was used to examine the association between milk yield and disease. We studied 8070 cows of second or higher parity from 25 New York State Holstein herds, calving between June 1990 and November 1993. Previous 305-d mature equivalent milk yield was used because most of the disorders studied occurred too early in lactation for current milk yield to be considered. Seven disorders were studied: retained placenta, metritis, ovarian cyst, milk fever, ketosis, abomasal displacement, and mastitis. A separate model was used for each disorder. Each model included, in addition to milk yield, parity, calving season, and herd. Results showed that higher milk yield was not a risk factor for any disease except mastitis. However, the association between higher previous milk yield and mastitis does not necessarily imply causation.

Key Words: disease • milk yield • dairy • cows • logistic regression

Submitted on February 10, 1995
Accepted on April 10, 1995




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Copyright © 1995 by the American Dairy Science Association ®.