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Aggression. --- Gland. --- Mice. --- Pheromones. --- Testosterone.

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Adult female mice. --- Adult. --- Female mice. --- Female. --- Mice. --- Testosterone.

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Dog. --- Dogs. --- Hypothalamus. --- Lesion. --- Lesions. --- Male. --- Secretion. --- Sexual behavior. --- Testosterone.

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Behavior. --- Gerbil. --- Marking behavior. --- Marking. --- Mongolian gerbil. --- Mongolian-gerbil. --- Testosterone. --- Time.

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The relations linking glucocorticoids, testosterone, social and sexual behaviour in vertebrates are complex and poorly understood. The conventional view is that: (1) subordinate individuals should have higher glucocorticoid concentrations (the subordination stress paradigm); (2) dominant and more active males during the breeding season should have higher testosterone concentrations; and (3) the relation between glucocorticoid and testosterone concentrations should be negative. I investigated the relation between hormones and behaviour in male ring-necked pheasants, Phasianus colchicus. Dominant and high-displaying males over the whole mating period had a higher level of both testosterone and corticosterone. As a consequence, testosterone and glucocorticoid levels were positively correlated. These results do not support the subordination stress paradigm, but they may support the stress-mediated version of the immunocompetence handicap hypothesis

Behaviour. --- Breeding. --- Corticosterone. --- Glucocorticoid. --- Glucocorticoids. --- Handicap. --- Hormone. --- Hormones. --- Level. --- Male. --- Males. --- Mating. --- Season. --- Sexual behaviour. --- Sexual. --- Social. --- Stress. --- Testosterone.