Temporal succession of the oestrous cycle and ovulation after administration to mares of PGF2alfa in preparation oestrophan
2011
Fazekaš, R., University of Veterinary Medicine and Pharmacy in Košice (Slovak Republic) | Hura, V.
This study investigated the occurrence of oestrus and ovulation in horses after the administration of Oestrophan, a F2 alpha prostaglandin preparation containing the active ingredient of cloprostenol. We examined 18 mares of three breeds; Slovak warm-blooded Horse, American Quarter Horse and Hutsul. They were dividend according to housing conditions and stress factors present at insemination. Oestrus detection was based on the external and internal symptoms and a gynaecological examination. Ovulation was detected by repeated ultrasonographic rectal examinations of the ovaries in 6 h intervals. In five mares, the ovulation appeared 39—87 h after administration of Oestrophan, in twelve 105—177 h and in three 207—231 h after administration of the preparation. When expressed in days, oestrus appeared within 4 days after the administration of Oestrophan and the subsequent onset of ovulation was detected within a maximum of 5 days after observation of oestrus signs. In mares that were in oestrus at our first examination, we detected the onset of ovulation within 5 days.
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