Androgens in peripheral blood of the red fox ( Vulpes vulpes L.) during the reproductive season and the anoestrus
Identifieur interne : 001846 ( Main/Exploration ); précédent : 001845; suivant : 001847Androgens in peripheral blood of the red fox ( Vulpes vulpes L.) during the reproductive season and the anoestrus
Auteurs : M. Mondain-Monval ; M. Bonnin [France] ; R. Scholler ; R. Canivenc [France]Source :
- Journal of Steroid Biochemistry [ 0022-4731 ] ; 1979.
Abstract
Androstenedione (A) and testosterone (T) were measured by radioimmunoassay after chromatography on celite micro-columns throughout the year in peripheral plasma of five vixens. There was a typical pattern in the fluctuations of A and T concentrations around the onset of oestrus. The A concentration rose from a basal level of 196.4 ± 120.4 pg/ml to 1543 ± 458 pg/ml (mean ± SD) within the 3 days preceding the increase of the progesterone (P) level. The concentration of T varied to a lesser degree. During the reproductive season, there was a significant positive correlation between these 2 steroids and estradiol (E2) levels. During the anoestrus, the A level was low (97.4 ± 43.7 pg/ml) and rose from October when corpora lutea had regressed and when follicles began to develop. A peak of T was detected in the early anoestrus and thereafter there appeared no characteristic change in the T level (62.0 ± 71.1 pg/ml). There was no A or T peak that might be associated to the episodic E2 release during the anoestrus.
Url:
DOI: 10.1016/0022-4731(79)90202-4
Affiliations:
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There was a typical pattern in the fluctuations of A and T concentrations around the onset of oestrus. The A concentration rose from a basal level of 196.4 ± 120.4 pg/ml to 1543 ± 458 pg/ml (mean ± SD) within the 3 days preceding the increase of the progesterone (P) level. The concentration of T varied to a lesser degree. During the reproductive season, there was a significant positive correlation between these 2 steroids and estradiol (E2) levels. During the anoestrus, the A level was low (97.4 ± 43.7 pg/ml) and rose from October when corpora lutea had regressed and when follicles began to develop. A peak of T was detected in the early anoestrus and thereafter there appeared no characteristic change in the T level (62.0 ± 71.1 pg/ml). 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