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  • Title: Plasma vitamin A composition and retinol-binding protein concentration during egg formation in laying hens.
    Author: Bárdos L.
    Journal: Int J Vitam Nutr Res; 1989; 59(3):251-4. PubMed ID: 2599791.
    Abstract:
    Blood plasma vitamin A composition (retinol, retinyl ester) and retinol-binding protein (RBP) were determined in three phases (empty; soft- and hard egg) of the egg formation period in laying hens. The retinyl ester level remained in the range of 6 to 11% of the total plasma vitamin A concentration during egg formation. The retinol and RBP increased significantly during the time of soft period. The molar ratio between retinol and RBP ranged between 0.72-0.77. The increase of retinol and RBP may be caused by the sexual steroid effect for satisfying the retinoid needs of the ovarium and shell gland (avian uterus).
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