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Journal of Dairy Science Vol. 82 No. 9 1927-1934
© 1999 by American Dairy Science Association ®
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Modeling of Energy Balance in Early Lactation and the Effect of Energy Deficits in Early Lactation on First Detected Estrus Postpartum in Dairy Cows

M. J. De Vries 1, S. Van Der Beek 2, L.M.T.E. Kaal-Lansbergen 2, W. Ouweltjes 3, and J.B.M. Wilmink 2

1 Animal Health Service, PO Box 9, 7418 EZ Deventer, The Netherlands
2 Cooöperatieve Rundveeverbetering Delta, Productdivision Dutch Cattle Syndicate, PO Box 454, 6800 AL Arnhem, The Netherlands
3 Research Station for Cattle, Sheep and Horse Husbandry, Runderweg 6, 8219 PK Lelystad, The Netherlands

The general pattern of energy balance in early lactation was modeled. For this purpose, several lactation curves were investigated. The best fitting curve was fit in a random regression model that provided predicted energy balance curves for all lactations. By use of these curves, total energy deficit per lactation, postpartum interval of return to positive energy balance, and nadir of energy balance was determined. In predicted energy balances, nadir of energy balance was present, but variation in postpartum interval to nadir was small. First lactation cows had a smaller energy deficit in early lactation than did older cows. Differences among cows in nadir and total energy deficits in early lactation were large. Both were related to the postpartum interval to first detected estrus with a larger energy deficit and a smaller nadir corresponding to a larger postpartum interval to first detected estrus. From this study, it can be concluded that large energy deficits in early lactation delay first detected estrus.

Key Words: energy balance • random regression • fertility

Submitted on November 2, 1998
Accepted on April 23, 1999




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