Abstract
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 = parturition), prolactin concentrations in daily samples fluctuated somewhat,
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