Plasma Vitamin A, D and E and Liver Vitamin A in Growing Holstein Friesian Bulls

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  • ホルスタイン種育成雄牛の血漿ビタミンA, D, E濃度と肝臓ビタミンA量
  • ホルスタインシュ イクセイ オウシ ノ ケッショウ ビタミン A D E ノウ

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Abstract

Thirty nine Holstein Friesian bulls raised for meat were examined at 1 to 22 months of age for plasma vitamin A, vitamin D metabolites and vitamin E and liver vitamin A. Plasma vitamin A and 25-hydroxyvitamin D increased with age. Liver vitamin A was lower in younger animals, gradually increasing with age. The levels of plasma 1, 25-dihydroxyvitamin D and alkaline phosphatase were higher at 10.5 months or less of age, suggesting the plasma concentration increasing with the bone growth. Plasma vitamin E was much lower in younger animals, increasing slightly with age.

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