[1] Univ Vet Med Hanover, Equine Clin, D-30559 Hannover, Germany
[2] Univ Vet Med, Dept Biol Sci & Pathobiol, Expt Endocrinol, A-1210 Vienna, Austria
[3] Univ Leipzig, Inst Anim Nutr, Nutr Dis & Dietet, D-04109 Leipzig, Germany
[4] Justus Liebig Univ Giessen, Inst Anim Breeding & Genet, D-35392 Giessen, Germany
[5] Equine Clin Destedt GmbH, D-38162 Destedt, Germany