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Experiences with Estrus Synchronization in Sheep over a Twelve-Year Period using Oral Map Treatment for Ten Days¹

Department of Physiology and Department of Internal Medicine, Veterinary College of Norway, Oslo.

Abstract

Covering a 12-year period, ewes were subjected to estrus synchronization using a daily dose of 50 mg 6-methyl-17-acetoxyprogesterone (MAP) for a period of 10 days during the breeding season. The experiments covered 378 individual cycles and 89.3% of the animals came into heat within the first 6 days after the last day of treatment. The conception rate at the first estrus was 74.4%. For the ewes not subjected to other forms of treatment, the average number of offspring resulting from 282 matings was 1.86 per ewe. Neither the duration of estrus nor the length of the gestation period deviated from normal values. Conception rate at first estrus was lower than in untreated sheep in Norway, but higher than in most other experiments on estrus synchronization. The average number of offspring was higher than the national average for untreated ewes. No deleterious effects of repeated treatment was observed, either in mothers or offspring.

¹ The authors are indebted to Leo Pharmaceuticals, Ballerup, Denmark, for the generous supply of Perlutex^®, the gestagen used during the long period covered by the experiments.