... bioassayable MSH and immunoreactive α MSH can be induced by transfer of animals between artificial light photoperiods of appropriate duration. Pituitary MSH Photoperiod Seasonal variation Neuroendocrinology JO: 309-312 (1980) Photoperiodic Dependence of Seasonal Changes in Pituitary Content...

...H.L. Buttle Bilateral anterior cervical sympathetic ganglionectomy in castrated male goats had no effect upon the subsequent seasonal variation in the concentration of prolactin (Prl) in plasma when surgery was performed in summer. After ganglionectomy in winter, however, the subsequent rise in Prl...