Plasma oxytocin and vasopressin concentrations in response to prostaglandin injection into the pig.

Abstract

A single i.m. injection of 5 mg PGF-2 alpha evoked a significant elevation of plasma oxytocin values in sows 6 days post partum and during dioestrus. Plasma vasopressin levels in dioestrous sows were not significantly affected by PGF-2 alpha. It is concluded that circulating steroid levels do not interfere with the response of oxytocin levels to PGF-2 alpha.