I feed mine layers pellets all year round with a little corn thrown in for keeping weight over the winter. I would say stick to normal feeding routine. According to calculations for 6-8 large fowl I am feeding 500g layers pellets twice a day, but that's only for large fowl like salmon faverolles. You would have to calculate the weight of the birds into it as well, like I did, and see what it amounts to. How much are you currently feeding them?