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Plasma and testicular estradiol and plasma androgen profile in the male frog Rana esculenta during the annual cycle

1986; Elsevier BV; Volume: 64; Issue: 3 Linguagem: Inglês

10.1016/0016-6480(86)90075-4

1095-6840

Bruno Varriale, Riccardo Pierantoni, Loredana Di Matteo, Sergio Minucci, Silvia Fasano, M. D'Antonio, G. Chieffi,

Physiological and biochemical adaptations

Seasonal plasma and testicular estradiol levels were measured in the male frogs, Rana esculenta, by radioimmunoassay. In plasma samples a simultaneous measurement of androgens was carried out in order to investigate a possible relationship between androgens and estradiol-17β. Concomitantly with the estradiol-17β peak in plasma and testes during the April–May period, plasma androgens sharply decreased.