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Ovariectomy is a treatment employed in the mare for removal of granulosa theca cell tumours (GCT), and for behaviour modification in mares that become aggressive during oestrus. The most common technique is laparoscopic ovariectomy under standing sedation, using sequential electrocoagulation and transection of the mesovarium. In the treatment of GCT the prognosis for resolution of behaviour and return to normal fertility is excellent. When treating mares exhibiting aggressive behaviour during oestrus, approximately 75 per cent of mares will show a significant improvement in their behaviour, over a course of up to 18 months.