How to ensure yolk colour?

The ideal yolk colour doesn’t exist, because it is heavily influenced by consumer preference. Asian consumers like an orange to red yolk, European consumers prefer golden yellow: as a producer you can tune your birds to the right yolk colour by adding natural raw materials to the layer feed such as yellow maize, Lucerne, dried vegetables or other plant materials. For example, grass meal will give a darker yolk colour and feeding most other grains will actually make the yolk lighter. A golden