befe76a6_al_Approach___The_Poultry_Site__Control
[Cause] Insufficient carotenoids in the feed [Control] 
The required yolk colour score, the percentage of egg production and daily feed consumption of the flock are the major factors governing the amount of pigment needed in the layer diet. Adjust levels of natural or synthetic carotenoids to meet these needs. Do not rely too much on feed ingredients such as lucerne or maize, whose pigment concentrations can vary widely.
Pale yolks - Optimum Egg Quality: A Practical Approach - The Poultry Site
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