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This work was supported by a grant from OTKA, No. T030769. We are grateful to Mrs Katalin Bara for her excellent technical assistance and to Mr. Szilamér Ferenczi for his consultative assistance.
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Kelemen, K., Péczely, P., Szőke, Z. et al. A Comparative Methodical Study of the Faecal Steroid Analysis on Birds: Looking for A Valid Method of Testosterone Determination. BIOLOGIA FUTURA 54, 285–298 (2003). https://doi.org/10.1556/ABiol.54.2003.3-4.7