The immunocompetence handicap hypothesis proposes that testosterone mediates a trade-off between sexual immunocompetence and signalling in men. of the pigments. Here, middle-aged and previous male red-legged partridges were treated with testosterone or manipulated as controls. In the current presence of high-testosterone amounts, middle-aged men elevated both circulating carotenoid color and amounts appearance, whereas their cell-mediated… Continue reading The immunocompetence handicap hypothesis proposes that testosterone mediates a trade-off between