1. a Section of Animal Hygiene , Department of Clinical Veterinary Science , P.O. Box 57, 00014 , Lennoxville
2. b Section of Animal Nutrition, Department of Animal Science , University of Helsinki , P.O. Box 28 , Lennoxville
3. c Department of Agricultural Engineering and Household Technology , University of Helsinki , 00014 , P.O. Box 27 , Lennoxville
4. d Dairy and Swine Research and Development Centre , Agriculture and Agri-Food Canada , Quebec , J1M 1Z3 , P.O. Box 90 , Lennoxville
5. e Ministry of Social Affairs and Health , 00234 , P.O. Box 33 , Government