1. Endocrinology Laboratory, University of Veterinary Medicine, 30173 Hanover, Germany.
2. Clinic for Cattle, University of Veterinary Medicine, 30173 Hanover, Germany.
3. Reproduction Unit, University of Veterinary Medicine, 30173 Hanover, Germany.
4. Faculty of Mathematics and Physics, Leibniz University, 30167 Hanover, Germany.
5. Ligandis GbR, 18276 Gülzow-Prüzen, Germany.
6. Institute for Genome Biology, Leibniz Institute for Farm Animal Biology, 18196 Dummerstorf, Germany.
7. National Institute for Agricultural Research, UMR1198 INRA-ENVA, Biologie du Développe et Reproduction, F-78350 Jouy-en-Josas, France.
8. Immunology Unit, University of Veterinary Medicine, 30173 Hanover, Germany.