You need a souce of fish meal , meat meal , meat & bone meal , any of these three will give you what they need in the direction of what they would eat while freeranging , plus being fed whole grains & seeds .
The layer pellets made today are made only with just what it takes for a bird to make an egg(their/feedmill's own admission)with nothing for feather quality , nothing for vitality , nothing for fertility , nothing for quality of life .
On birds that i really want to lay or continue to lay i like to use chick starter/grower or chick starter with their whole grains , seeds and protein supplement , the hens love the chick starter/grower in a wet mix .
Hope this helps,
Shannon