1. Department of Genetics and Breeding of Farm Animals, Institute of Animal Science, Prague, Czech Republic
2. Agricultural Market Department, Institute of Agricultural Economics and Information, Prague, Czech Republic
3. Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Praha 6—Suchdol, Czech Republic
4. Department of Biology of Reproduction, Institute of Animal Science, Prague, Czech Republic
5. Department of Milk Recording, Czech Moravian Breeders’ Corporation, Inc., Hradištko, Czech Republic