Methods for the treatment of twin pregnancy in the mare

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Abstract
Within a group of 130 mares which, in the event, carried twin pregnancies, 29 (22.3%) produced their twins following diagnosis of a single palpable follicle at service and a single pregnancy 42 days later. The whole group of 130 twin-pregnant mares gave birth to only 17 live foals (13%). Breeding results for the following season were available for 102 of these mares, when 38 (37%) produced live foals. Over the 2 seasons an average of 23% of this group produced live foals. In a 2nd group, comprising 70 mares, twin pregnancy had been diagnosed in all of them by rectal palpation. Five methods of treatment were then applied to 5 subgroups of mares and 20 (28%) of the 70 mares produced live foals that season. Breeding results for the following season were available for 53 of these mares; 33 (61%) then produced live foals. Over the 2 seasons an average of 46% of the treated group produced live foals. The administration of a prostaglandin analog at less than 35 days of gestation was outstandingly successful as a method of treatment.

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