Abstract
The carotenoids in the supraocular combs of male capercaillie Tetrao urogallus offered two different, specified diets were examined quantitatively and qualitatively. Birds offered the diet richest in carotenoids (zeaxanthin and lutein) experienced the highest carotenoid concentrations (36 μg per bird). (3S,3′S)-Astaxanthin diester, accompanied by lesser amounts of its monoester and the free diol, were the major carotenoids, compatible with a metabolic conversion of (3R,3′R)-zeaxanthin by the bird.
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