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The objective of this study was to evaluate the reproductive performance of 51 Dorper ewes during non-breeding season under tropical conditions of Mexico. The experiment was carried out on “Las Delicias” farm, located in the municipality of Metapa de Dominguez, Chiapas (14° 50' 08” N and 92° 11' 28” W), with an altitude of 100 m above sea level. The predominant climate is warm-humid with rainfalls in the summer, annual mean temperature of 25°C and annual mean precipitation of 2 200 mm. The ewes were assigned to a completely randomized unbalanced design with three treatments and different number of replications, where the replication was represented by one ewe. Treatment 1(T1) was considered as control, where the ewes remained constantly with the male, during the time of the experiment. An intravaginal sponge impregnated with 65 mg of medroxiprogesterone (MPA) was introduced to treatment 2 ewes (T2) during 12 days, and at removing it, 500 I. U. equine chorionic gonadotrophin were applied. On the next day, the ewes were exposed to three males of the same breed of proven fertility, and in treatment 3 (T3), the ewes under study received a dose of 100 μg releasing gonadotrophin hormone (GnRH) intramuscularly, 5 days afterwards, 7.5 mg of Luprostiol, and 36 h later, a second dose of GnRH were applied. The sheep showing premature estrus during the hormonal treatment were natural breeding with the male every six hours, until completing three services. The variables of the study were: onset of estrus, distribution of estrus, estrus percentages, pregnancy percentages and prolificacy percentages. Data were analyzed using the GLM procedures of SAS for a completely randomized design and the proportion variables with the T student test. Estrus percentages were 65, 93.3, and 25% for T1, T2, and T3, respectively. The average pregnancy percentage was 43.7%, being 40, 60, and 18.6% for T1, T2, and T3, respectively, and the prolificacy percentage was 100% for T1, T2, and T3 respectively. It is concluded that intravaginal sponges impregnated with 65 mg of medroxiprogesterone acetate used during 12 days, plus 500 I. U. of eCG, efficiently synchronize estrus in Dorper ewes, whereas ovsynch scheme presented low pregnancy and prolificacy percentage.

Reproductive Performance in Dorper Ewes Synchronized at Estrus During non Breeding Season in Tropical Conditions