Effects of Sunlight Illumination of Marigold Flower Meals on Egg Yolk Pigmentation

The effect of sunlight illumination of marigold flower meal on the pigmentation of feed for laying hens and of their resulting egg yolks was evaluated by high-performance liquid chromatography and by subjective and light reflectance colorimetry techniques. Illumination did not have an effect on the...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1998-02, Vol.46 (2), p.698-706
Main Authors: Delgado-Vargas, Francisco, Paredes-López, Octavio, Avila-González, Ernesto
Format: Article
Language:English
Subjects:
ANIMAL FEEDING
Animal productions
Biological and medical sciences
CAROTENOIDS
CHEMICAL COMPOSITION
CHICKENS
COLOUR
Egg and egg product industries
EGG YOLK
FEED ADDITIVES
FEED MEALS
FEEDS
FLOWERS
Food industries
Fundamental and applied biological sciences. Psychology
LIGHTING
OLEORESINS
PIGMENTATION
SOLAR RADIATION
TAGETES
TAGETES ERECTA
TEMPERATURE
Terrestrial animal productions
Vertebrates
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Summary:The effect of sunlight illumination of marigold flower meal on the pigmentation of feed for laying hens and of their resulting egg yolks was evaluated by high-performance liquid chromatography and by subjective and light reflectance colorimetry techniques. Illumination did not have an effect on the identity of carotenoids in the flower meal. Interestingly, illuminated marigold flower meals yielded an oleoresin with a higher all-trans-zeaxanthin level, with respect to meals kept in darkness. A higher level of all-trans-zeaxanthin was also present in feed pigmented with that oleoresin. Additionally, this pigmented feed showed the best color values and resulted in egg yolks with good color; remarkably, these egg yolks had a low pigment content with respect to control treatments. Thus, sunlight illumination of marigold flower meal showed a positive effect on egg yolk color; the main factors contributing to this effect were not the identity or quantity of carotenoids in laying hen feed or egg yolks, but rather other as yet unidentified marigold component(s) which was (were) somehow influenced by sunlight illumination. Keywords: Lutein; carotenoids; color; in vivo pigmentation; marigold; Tagetes
ISSN:0021-8561
1520-5118
DOI:10.1021/jf9702454