“…Photoperiodically induced seasonal changes in prolactin are thought to influence gonadal maturation and regression. Treatment of photoregressed adult male hamsters with exogenous prolactin stimulated testicular growth (Bex et al, 1978), as did treatment of juveniles with ectopie pituitary transplants (Stallings et al, 1985). Treatment of juvenile males with bromocryptine, a dopamine agonist which depresses endogenous prolactin, retarded maturation (Stallings et al, 1985;Stroud et al, 1985).…”