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- W2060752074 abstract "Serum retinol, retinyl palmitate, β-carotene, cryptoxanthin, lutein, α-tocopherol and γ-tocopherol were measured in 18 captive Humboldt penguins (Spheniscus humboldti) prior to and following the removal of Columbia River (CR) smelt (Thaleichthys pacificus) from the diet. Dietary vitamin A was reduced from 59.8 to 13.5 IU g−1 (dry matter basis) when CR smelt was removed from the diet. Minimal changes were noted in dietary vitamin E. Serum samples Without-CR smelt had significantly lower circulating retinol (1.19±0.09 vs. 1.94±0.08 μg ml−1) and retinyl palmitate (0.033±0.012 vs. 0.105±0.004 μg ml−1) compared to samples With-CR. The Without-CR smelt diet resulted in increased serum α-tocopherol from 26.4±0.94 to 39.1±3.72 μg ml−1. More serum samples taken Without-CR smelt had detectable levels of γ-tocopherol than those With-CR smelt. Serum lutein was higher for the samples taken Without versus With-CR smelt. Serum cryptoxanthin did not differ. β-Carotene was not detected. Data indicate that high levels of dietary vitamin A can affect circulating levels of retinol, retinyl palmitate and vitamin E. Thus, dietary vitamin A and the interrelationship between vitamins A and E should be considered when assessing captive penguins." @default.
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- W2060752074 date "1998-12-01" @default.
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- W2060752074 title "Influence of dietary vitamins A and E on serum α- and γ-tocopherols, retinol, retinyl palmitate and carotenoid concentrations in Humboldt penguins (Spheniscus humboldti)" @default.
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- W2060752074 doi "https://doi.org/10.1016/s1095-6433(98)10131-9" @default.
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