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Deposition of carotenoids in egg yolk by short-term supplement of coloured carrot (Daucus carota) varieties as forage material for egg-laying hens

Hammershoj, Marianne; Kidmose, Ulla and Steenfeldt, Sanna (2010) Deposition of carotenoids in egg yolk by short-term supplement of coloured carrot (Daucus carota) varieties as forage material for egg-laying hens. Journal of the Science of Food and Agriculture, 90, pp. 1163-1171.

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Summary

BACKGROUND: Supplying egg-laying hens with different forage materials may influence egg production and quality. The aim
of this study was to examine the short-term effects of standard feed plus 70 g day−1 per hen of three coloured carrot varieties (orange, yellow and purple) as forage material in comparison with a standard feed control on egg production, egg yolk colour and deposition of carotenoids in the yolk.
RESULTS: Carrot supplementation reduced feed intakes significantly, but not on a dry matter basis. Orange carrot treatment significantly reduced egg mass production, whereas yellow and purple carrot treatments did not differ from the control. Egg and yolk weights of all carrot-supplemented treatmentswere significantly lower than those of the control, but yolk percentages were similar. Yolk redness increased significantly in the order control < yellow < orange < purple. A similar trend was seen
for yolk yellowness, but yellow and orange carrots reached the same level. Yolk colour and carotenoid contents correlated positively and significantly. In particular, purple carrot treatment increased the yolk content of lutein (>1.5-fold) and β-carotene (>100-fold) compared with the control.
CONCLUSION: Supplementing the feed of egg-laying hens with coloured carrots efficiently increased yolk colour parameters and carotenoid contents, which gives opportunities for improved nutritional value of eggs from forage material-supplemented hens.


EPrint Type:Journal paper
Keywords:eggs, carotenoids, lutein, yolk colour, forage material, carrots
Subjects: Food systems > Food security, food quality and human health
Research affiliation: Denmark > DARCOF III (2005-2010) > QEMP - Integrity and quality of organic meat and egg
Deposited By: Hammershoj, Senior Scientist Marianne
ID Code:18192
Deposited On:12 Jan 2011 07:48
Last Modified:12 Jan 2011 07:48
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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