... on the circannual reproductive rhythm. There was indeed a difference in the period and waveform of the testicular cycles between the three light conditions: mean circannual period was significantly longer and the overall amplitude of the growth–regression curve was higher under T24 than under T7 or LL ( Fig. 3...

... month) while the number of GnIH-ir neurons was recorded only in male birds ( n =4 per month). Fig. 2. GnIH immunoreactivity in the paraventricular nucleus (PVN) during the annual testicular cycle in P. montanus . (A–D) GnIH expression in the progressive (A), reproductive (B), regressive (C...