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Effects of vitamin D(3) -enriched diet on egg yolk vitamin D(3) content and yolk quality

Effects of vitamin D(3) -enriched diet on egg yolk vitamin D(3) content and yolk quality

Journal of Food Science 78(2): C178-C183

ISSN/ISBN: 0022-1147

PMID: 23331294

DOI: 10.1111/1750-3841.12032

A 40-wk experiment was conducted using Hy-Line W-36 laying hens (19-wk old) to investigate the impact of feeding cholecalciferol-enriched diets on egg yolk quality. Feeds were enriched with 4 cholecalciferol levels, 9700 (diet 2), 17200 (diet 3), 24700 (diet 4), and 102200 (diet 5) IU/kg feed. The control (diet 1) contained 2200 IU cholecalciferol/kg feed. Eggs from each replicate group of enriched diets were collected daily and the yolks were pooled into 2-d period during the first 2 wk. During weeks 3, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, and 40, pooled samples were generated by daily collection of 3 consecutive days of egg production. The cholecalciferol content of egg yolk from the enriched diets increased rapidly during the first 3 wk. The peak cholecalciferol concentrations in egg yolk that occurred at week 3 were 865, 1641, 2411, and 34815 IU/100 g egg yolk (wet basis) from diet 2 to 5. The average cholecalciferol concentration in yolk during weeks 3 to 40 and the deposition rate of cholecalciferol during the first 3 wk were both linearly increased with the dietary cholecalciferol level when the feed contained no more than 24700 IU/kg cholecalciferol. Egg yolk lipid profile (total lipid content, fatty acid composition, phospholipid composition, and unsaponifiables), physical and functional properties (yolk viscosity and emulsifying property), and sensory quality of hard-boiled egg yolk were not affected by the cholecalciferol enrichment in the feed. A linear dose-response relationship between dietary vitamin D(3) level and egg yolk vitamin D(3) content was established at relatively low enrichment levels. Such relationship can be used to formulate feed to achieve a target egg vitamin D level. High vitamin D yolk showed no difference from the conventional yolk in other compositional, functional, and sensory properties.

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