Affiliation: | 1. Department of Clinical Sciences, Faculty of Veterinary Medicine and Animal Science, Swedish University of Agricultural Sciences, Box 7054, SE-750 07, Uppsala, Sweden 3. Faculty of Veterinary Medicine, Addis Ababa University, P.O. Box 34, Debre Zeit, Ethiopia 2. Swedish Dairy Association, SE-63184, Uppsala, Sweden 4. Department of Physiology of Animal Reproduction, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
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