Hi Ben, Sorry if i missed it but you don't say what you are feeding barley too. I feed whole barley to my ducks and geese. Given the choice they seem to prefer whole barley to rolled barley or whole wheat or there least fav rye
To increase egg production i some times buy some layers pellets and mix it with the barley but at the moment i have some 34% soya pellets which is added sparingly to the whole barley and they are laying well on it.