Abstract
The purpose of the experiment was to obtain preparatory information about the presence of prostaglandins in semen collected from various types of horses after different periods of sexual rest. Semen was collected with an artificial vagina. Prostaglandin-like activity was estimated by the bioassay procedure described by Vane (1). Results are expressed in ng/ml PGE 2 of seminal plasma. The total concentration of prostaglandins in the full ejaculate averaged 43.73 ± 4.93 ng/ml of plasma while the total amount of prostaglandins in the ejaculate was 1076 ng. Taking into consideration the period of sexual rest in the stallion, statistically significant differences were found in the prostaglandin level in the semen of all the stallions.
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