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Plasma concentrations of testosterone, measured weekly in 16 Ouled-Djellal rams in Algeria, were lowest in autumn and early winter months, increased in February-March and reached highest levels (about 5 ng/ml) in early summer, before decreasing in autumn. Plasma dihydrotestosterone levels were very low and paralled those of testosterone until July (50 pg/ml); there was then an unexplained rise in October-November (50 pg/ml). The metabolic clearance rate of testosterone was low in November and January, and significantly increased in March and June (about 2000 1/24 h). Consequently, the production rate of testosterone was approximately 5-fold higher in June than in January. These data suggest that the short-day photoperiodic theory is not applicable to all breeds of sheep or to all environmental conditions.

Seasonal variations in plasma testosterone and dihydrotestosterone levels and in metabolic clearance rate of testosterone in rams in Algeria