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Showing 1 to 2 of 2 for “"Yolk Carotenoids"”.
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Laying-Sequence Variation in Yolk Carotenoids of Eastern Bluebirds
<p>Carotenoids are naturally occurring, fat-soluble pigments that play an important role in the embryonic development of songbirds. Female songbirds use different strategies to allocate these important maternal resources to their eggs. Little research has been done on whether North American …
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Female Ornamentation in the American Robin
… reproductive investment, I measured egg size, yolk proportion, and deposition of yolk testosterone and carotenoids. Females with brighter (lighter) carotenoid-based bill colour laid larger eggs, and females with yellower bills laid eggs with higher yolk proportions and more total yolk …