@CarlaCo what kind of chickens do you have?
In my country we have a supplier that informs pretty good about their poultry feed. Only miss the amounts of each ingredient.
Bio-Ron Poultry Mix
Rich organic blend of whole grains, cracked corn and seeds. It contains a total of 10 different ingredients.
Suitable for chickens and other poultry such as peacocks, ducks, geese, fowls, ostriches, swans, etc.
Composition:
Wheat, barley, sunflower seeds, broken corn, black oats, lupine, buckwheat, spelt, peas and linseed.
Free range animals
For animals that can forage outside and can also find fresh greenery and insects there, we recommend feeding the poultry mix as a basis and always making chicken grit plus freely available.
In addition, alternately offer some extra seaweed, bokashi, sunflower seeds, hemp seed or/and bio-chi for extra vitamins. All this together should in principle ensure that the animals receive everything they need to live a healthy life.
Laying crumble and laying pellets are actually products intended for production animals that have to deliver a lot of eggs and/or meat quickly. They can possibly be fed as an extra supplement in addition to the grain, for example in winter or/and moulting periods.
There is more on that page (interested? Use translate from Dutch to English)
https://www.bio-ron.com/producten/diervoeding/kippen-voeding/