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Androgenes et 17-estradiol plasmatiques de lurodele pyreneen Euproctus asper durant la periode de reproduction



Androgenes et 17-estradiol plasmatiques de lurodele pyreneen Euproctus asper durant la periode de reproduction



General and Comparative Endocrinology, 583: 337-341



The concentration of plasma androgens (A) and 17.beta.-estradiol (E) in both males and females of Euproctus asper from June to Nov. was determined by radioimmunoassay. The levels of A 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 Sept. and a decrease in Oct.-Nov. The concentration of A 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 Sept. The values of E in females showed a different pattern during the reproductive cycle. The concentration was at a maximum in Sept., at the same time of the low concentration of A. In the males, the concentration of E was very low (< 17 ng/100 ml). Measurements of adenohypophysial volume and gonadotropic cell diameter are discussed with respect to levels of circulating steroids.

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