PROSTAGLANDIN-F2-ALPHA RELEASE ASSOCIATED WITH AN EMBRYO-TRANSFER PROCEDURE IN THE MARE

The pattern of the main metabolite of prostaglandin (PG) F-2 alpha was recorded following a nonsurgical embryo transfer technique in 9 mares under field conditions in Estonia, Three patterns were observed, Two of them were characterised by PG release, thereas the third was not. A tendency towards a shortened cycle was seen in 3 mares, Observations were made regarding the manipulation of the uterus as being normal or difficult to perform. In general, mares where the procedure was consid ered difficult were also found to have a PG release.