Resumen:
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Whether the steroid hormone is primarily passed into urine or feces is species-dependent, and this information is useful to a precise endocrine monitoring; in excretes metabolite concentrations arefrequently several times higher than the concentration in blood.Wild Chinchilla lanigera is threatened (CITES I), although, domesticated form is widespread in breeding farms. Our experience on its reproductive endocrinology rises from radioinfusion studiesof testosterone (in males), estradiol, progesterone (in females) and corticosterone (in both sexes). Testosterone, estradiol and corticosterone metabolites were excreted mainly by urine (84.7±4.2%, 71.7±12.1%, 86.9±0.07% respectively), while progesterone was detected in equal amounts of both excretes. Therefore, we proposed that the urinary route is preferential in Hystricognathi (chinchilla and guinea p