Abstract
An experiment was conducted to measure plasma oxytocin concentrations at 4 different stages of the estrous cycle in 11 pony mares. Plasma oxytocin concentrations (μU/ml ± SE) were found to be higher (P<.01) on day 2 of estrous (39.8 ± 12.5) and day 5 post-ovulation (33.1 ± 12.0) than on day 10 (2.3 ± 1.6) and day 15 post-ovulation (6.8 ± 4.1). A second experiment was conducted to measure jugular plasma oxytocin concentrations before and after sexual arousal in six pony stallions. Oxytocin concentrations (μU/ml ± SE) were higher (P<0.06) after sexual arousal (50.5 ± 8.9) than before sexual arousal (23.8 ± 2.9). These data suggest plasma oxytocin concentrations may be associated with ovarian function in mares and with sexual behavior in stallions.
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