Endocrine and physiological events that precede and accompany parturition in the sow occur in a sequential fashion starting with a slow increase in estrogens from about three weeks prior to parturition. The luteotrophic role of LH visible as a distinct LH-progesterone relation is present at three we
Chronic implantation of extracellular electrodes on successive uterine segments of pregnant miniature sows and marking of their fetuses were performed in order to relate characteristics of uterine electrical activity during delivery with the sequence of expulsion of piglets. The electromyographs du
Plasma concentrations of prolactin, progesterone and oestradiol-17β were measured by radioimmunoassay in samples taken from 2–15 days before until 1–4 days after spontaneous parturition in four sows and in one sow around prostaglandin F2α-induced parturition. Between Days −15 and −2 (Day 0 = partur
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