from 445 to 450 nm), whereas canthaxanthin is a red carotenoid (wavelength from 465 to 470 nm).


The principle of egg yolk pigmentation There are two components of egg yolk pigmentation. The first (referred to as the saturation phase) involves the deposition of yellow carotenoids to create a yellow base corresponding to a DSM YolkFan™


DSM YolkFan™ The DSM YolkFan™


provides a simple means of measuring yolk


colour and is available as a printed fan with 16 blades as well as a digital version.


score around


7. Such a yellow base is very important for good saturation of the final colour. Once the yellow base is established, the addition of the red carotenoid canthaxanthin (CAROPHYLL®


red) changes the hue to


a more orange-red colour (the second component, or colour phase). The dose-related colour response to red carotenoids is higher than the response to yellow carotenoids, and the combination of yellow and red carotenoids is therefore more cost-effective for egg yolk pigmentation. Figure 3 illustrates this principle.


Figure 3. Egg yolk pigmentation phases The requisite colour is chosen from a range of 16 different shades.


yellow to the feed. The result is a perfect egg yolk colour every time – which is just what the consumer asks for.


The depth of the shade determines how much of each carotenoid is needed. Consider the xanthophyll contribution of the feed ingredients and add the recommended amount of CAROPHYLL® CAROPHYLL®


red and


Regarding the relative pigmenting efficiencies of the yellow carotenoids, apo-ester (CAROPHYLL®


yellow) is more efficient than lutein and


zeaxanthin, the main carotenoids in feedstuffs. The very high deposition rate of apo-ester (CAROPHYLL®


yellow) makes it the most suitable


yellow carotenoid for the saturation phase. Table 1 below shows the relative pigmenting efficiency of yellow carotenoids (based on deposition rates).


Table 1. Relative pigmenting efficiency of yellow carotenoids


For more information and guidelines how to use it, see https://www.dsm.com/markets/anh/en_US/products/products- carotenoids/products-carotenoids-carophyll.html or call +44 (0) 1773 536500


The full article by Fernando Cisneros was published on DSM Feed Talks on 5 September 2018 (https://www.dsm.com/anh/en/feedtalks/eggyolk-pigmentation-guidelines.html)


FEED COMPOUNDER MARCH/APRIL 2019 PAGE 27


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