Summary. Plasma prolactin concentrations were determined by radioimmunoassay during oestrous cycles and around the time of oestrus in different types of primitive gilts: Vietnamese, Zlotnicka and wild-boar × domestic pig hybrids. The animals were bled without stress from an indwelling arterial catheter. The following results were obtained: (1) in all gilts the main prolactin peak was observed at Day 15 or 16 of the oestrous cycle; (2) Vietnamese and hybrid gilts showed a second smaller prolactin surge after (Day 2) or before (Day 17) oestrus; (3) base levels of prolactin during the oestrous cycle were 14·8 ± 0·93 ng/ml (Vietnamese gilts), 13·2 ± 1·05 ng/ml (Zlotnicka gilts) and 15·6 ± 2·01 ng/ml (hybrid gilts). The 15–16-day prolactin peaks reached maximum values of 36·4, 43·4 and 56·5 ng/ml respectively.
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