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Effect of short-term UVB exposure on vitamin D concentration of eggs and vitamin D status of laying hens.

Lietzow J1, Kluge H, Brandsch C, Seeburg N, Hirche F, Glomb M, Stangl GI.

Author information

Abstract

Vitamin D deficiency in humans is widespread, and only a few food items are important natural sources of vitamin D. This 

study investigated the effect of UVB exposure of laying hens on the vitamin D content in egg yolk. In a two-factorial design, 

hens fed a vitamin D-deficient (-D) or -adequate (+D) diet were nonexposed or exposed to UVB light over a period of 4 weeks. 

UVB exposure of the -D group caused nearly normal egg production rate and egg shell quality; exposure of the +D group did not 

further improve these parameters. UVB exposure tended to improve the concentration of plasma 25-hydroxycholecalciferol (25

(OH)D(3)), but had no effect on 1,25-dihydroxycholecalciferol in plasma or on cholecalciferol and 25(OH)D(3) in egg yolk. The 

present study shows that a short-term exposure of laying hens to UVB light is not an appropriate way to improve the vitamin D 

content of egg yolk.

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