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- Faculty of Veterinary Medicine, Department of Herd Health and Reproduction, P.O. Box 80151, 3508 TD Utrecht, the Netherlands.
- Wageningen Agricultural University, Department of Economics and Management, P.O. Box 338, 6700 AH Wageningen, the Netherlands.
- Animal Health Service, Location Hovel P.O. Box 4, 5280 AA Boxtel, the Netherlands.
- Correspondence address/address for requests for reprints: J. Enting, c/o Wageningen Agricultural University, Department of Economics and Management, P.O. Box 338, 6700 AH Wageningen, the Netherlands. Phone: + 31 317 484065,fax: +31 317 482745, e‐mail: [email protected]