Effects of Testosterone Propionate and Pituitary-adrenal Hormones on the Social Behaviour of Male Ducklings (Anas platyrhynchos L.) in two Test Situations

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Abstract
This experiment was designed to study in male ducklings the behavioral influence of testosterone propionate (TP) injections, combined with pituitary-adrenal hormone administration in groups of birds either from the same residence cage or from visually isolated cages. TP administration increased sexual but not aggressive behavior, while pituitary-adrenal hormones induced very few effects. The responses of the birds were modulated to a large extent by the type of test situation.