title: Peripheral plasma prolactin concentrations during oestrous cycles in different types of primitive gilt.
abstract: 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 X 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.
mesh_terms: D000818:Animals; D004971:Estrus; D005260:Female; D011247:Pregnancy; D011388:Prolactin / Q000097:blood*; D011863:Radioimmunoassay; D013552:Swine / Q000097:blood*
chemical_list: D011388:Prolactin