Özet:

The aim of this study was to investigate the influence of intramuscularly administered cloprostenol, to purebred Arabian mares at 500 mg dose on estrous synchronization and pregnancy rates.This study was carried out on 30 mares aged from 6 to 17 years. The animals were divided into two groups as treated (n:15) and control (n:15). Cloprostenol 500 mg was intramuscularly injected to the treated mares with luteal structure on their ovaries detected by ultrasonography. Control group consisted of mares in estrus spontanously. All the mares having follicles ≥ 30 mm on their ovaries and giving positive reactions to teaser stallion were bred twice every other day. Of mares (73.3%) in treated group 11 were detected to enter estrus in days 3.00 ± 1.09 after the cloprostenol injection. Pregnancy was detected at the rate of 63.7% in treated group and 53.3% in control group in the ultrasonographic examinations of pregnancy performed 20 days after bred. There was no statistically difference between treated and control groups for pregnancy rates. As a result, it was concluded that administration of single cloprostenol dose in luteal phase caused estrus synchronization. Pregnancy rate was not impaired by this treatment

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