Myometrial Electrical Activity and Plasma Concentrations of Progesterone, Estrogens and Oxytocin during Late Pregnancy and Parturition in the Miniature Pig

Abstract
A multifactorial approach was attempted to establish the sequence of events that lead to parturition in the miniature pig. Uterine electrical activity recorded with chronic electrodes implanted in the uterine muscle was correlated with concurrent maternal plasma levels of progesterone, estrone, estradiol-1713 and oxytocin. In 7 sows that farrowed at normal term the period of observation covered the last 3 weeks of pregnancy up to the end of parturition.

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