The influence of hormones on amino acid partition to the skin and wool growth appears to be indirect. This could be attributed to passive changes in the skin that result from hormone-induced alteration of amino acid metabolism in the body. Adams et al. (2000) reviewed the effects of hormones, including IGF-1, insulin, growth hormone, androgens, p-adrenergic agonist, thyroxine and Cortisol on wool growth and follicle activities, and pointed out: 'there are no hormones with a homeorrhoetic function to direct nutrients to the skin. However, hormones do affect wool growth through their effects on whole body protein synthesis, or by affecting protein metabolism in other organs'.
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