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For the current study, it were used fecal samples from 50 psittacines, previously sexed by PCR from blood cells. The fecal androgens and estrogens metabolites were extracted with PBS (Phosfate Buffer Saline) or PBS:Ethil Alchool (4:1) and measured by comercial radioimunoassay kits at the "Laboratorio de Dosagens Hormonais" of the "Departamento de Reproducao Animal" of the "Faculdade de Medicina Veterinaria e Zootecnia" of the "Universidade de Sao Paulo". The sex determination of the birds were performed using the confidence interval (95%) for transformed androgens values. 70% of birds had the sex confirmed by radioimunoassay. The results showed that further studies for sex determination on monomorphic birds by non-invasive techniques are necessary.

Determinação do sexo de psitacídeos por radioimunoensaio (RIE) de esteróides sexuais a partir de excretas cloacais