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2002, Reproductive biology
The involvement of oxytocin (OT) in the regulation of glucocorticoid secretion during stress reaction, parturition, and suckling has been documented in various species. In this study four in vivo experiments were conducted on gilts (1) to demonstrate the influence of mating stimuli on plasma cortisol concentration, (2) to test the effect of OT alone and (3) OT combined with OT-antagonist on cortisol secretion and (4) to clarify the role of progesterone and estradiol in cortisol response to exogenous OT. In experiment 1, plasma cortisol concentration in gilts (n=4) increased (p<0.05) from 16.1 +/- 5.3 ng ml(-)1 (control period: 30 min before mating) to 42.8 +/- 11.6 ng ml(-1) and 46.6 +/- 9.6 ng ml(-1) at the time of leaving the pen and during the first visual and olfactory contact with the boar, respectively. During coitus the elevation was maintained (48.8 +/- 9.8 ng ml(-1); p<0.05 vs. control). The plasma cortisol concentration returned to pre-mating levels within 30 min aft...
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