[Plasma androgens and 17 beta-estradiol of the Pyrenean urodele Euproctus asper during the period of reproduction].
The concentration of plasma androgens (A) and 17 beta-estradiol (E) in both males and females of Euproctus asper from June to November was determined by radioimmunoassay. The levels of androgens in males varied from a maximum of 980 ng/100 ml in June to a minimum of 172.5 ng/100 ml in July. A small increase was observed in September and a decrease in October-November. The concentration of androgens in females was comparable to that of males at the end of the cycle: 320 ng/100 ml; the values were high (470 ng/100 ml) in July and decreased to a minimum (80 ng) in September. The values of 17 beta-estradiol in females showed a different pattern during the reproductive cycle. The concentration was at a maximum in September, at the same time of the low concentration of androgens. In the males, the concentration of estradiol was very low (less than 17 ng/100 ml). Measurements of adenohypophysial volume and gonadotrophic cell diameter are discussed with respect to levels of circulating steroids.
D000728:Androgens / Q000097:blood*; D000818:Animals; D004958:Estradiol / Q000097:blood*; D005260:Female; D006062:Gonadotropins / Q000378:metabolism; D008297:Male; D010903:Pituitary Gland, Anterior / Q000033:anatomy & histology; D012098:Reproduction; D012621:Seasons; D013091:Spermatogenesis; D014562:Caudata / Q000097:blood*
D000728:Androgens; D006062:Gonadotropins; D004958:Estradiol
Androgènes et 17 beta-Estradiol plasmatiques de l'Urodèle pyrénéen Euproctus asper durant la période de reproduction.