For a more intense orange color of the yolk in poultry farms, the preparation "Biofon Red", containing the extract of the fruits of red pepper (Capsicum Annum), is added to the feed for layers. It contains the amount of red carotenoids, xanthophylls, mainly capsorubin and capsanthin. No left-handed chemistry, only natural pepper paint.
How natural it is - decide for yourself.
At my home quail farm, one summer, for the sake of interest, I poured a small amount of dried petals of marigold flowers into the feed. The color of the yolks became more intense.
See See also: Using carotene-containing preparations to obtain enriched quail eggs
Buy homemade eggs from a poultry farm and see the difference. In the course of cooks, we were told that poultry and poultry farms even have different meat, since poultry has a more varied feed, plus access to uh ... how to say, mating. For birds from poultry farms, the feed consists of compound feed, and the roosters are allowed to eat immediately
But this applies to meat, and as for eggs, the light color depends both on the feed and on the chicken's access to sex. When placed in an incubator, light eggs will not produce chicks, although the energy value is not lost
PS. We were told this in practice, I have not read special literature, so it may be a mistake