Ovariohysterectomy in mares: 17 cases (1988–2007) - Freeman, DE; Rötting, AK; Köllman, M; Doyle, AJ; Troedsson, MHT; Pozor, M; Lock, T; Stewart, A; Trumble, T (Proceedings of the 53rd Annual Convention of the American Association of Equine Practitioners, 2007)