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  • 1 Freie Universität Berlin Equine Clinic: Surgery and Radiology, Department of Veterinary Medicine Oertzenweg 19b 14163 Berlin Germany
  • | 2 Virbac Animal Health Bad Oldesloe Germany
  • | 3 Freie Universität Berlin Institute of Veterinary Pathology and Department of Veterinary Medicine Berlin Germany
  • | 4 Warsaw University of Life Sciences Department for Large Animal Diseases, Faculty of Veterinary Medicine Warsaw Poland
  • | 5 Tierärztliche Praxis für Pferde Pacolt & Labann Alte Quernheimer Str. 82 32278 Kirchlengern Germany
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This case report describes the use of a subcutaneously applied 4.7-mg deslorelin acetate implant in a three-year-old Arabian crossbred stallion showing unwanted strong male behaviour. Following deslorelin acetate implantation the stallion showed a short transitional increase in male behaviour. A ‘gelding-like’ behaviour was noted 15 days (D15) after treatment. The horse was surgically castrated at the owners request at D52 after treatment. Serum testosterone, oestradiol-17β and oestrone sulphate values decreased after deslorelin acetate implantation, but serum LH and FSH levels remained unchanged. Histopathological analysis of both testes and sperm analysis revealed a reduced spermatogenesis at D52. The testicular volume decreased after treatment. The use of a subcutaneously applied deslorelin acetate implant might be a promising tool to change the behaviour of aggressive stallions.

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