1. Department of Nutrition, Exercise and Sports, University of Copenhagen, Frederiksberg;
2. National Veterinary Institute, Technical University of Denmark, Frederiksberg;
3. Chr. Hansen, Hørsholm;
4. Department of Animal Health and Bioscience, Aarhus University, Foulum;
5. Department of Reproduction, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark;
6. Institute of Medical Sciences, University of Aberdeen, United Kingdom;
7. U. S. Department of Agriculture/Agricultural Research Service, Children's Nutrition Research Center, Houston, Texas