what sort of peas are you offering? I've found that, besides the individual preferences of different birds, and the benefits of fermenting or at least soaking overnight, as mentioned by different posters above, none of my flock are keen on maple peas, while almost all like blue and green peas, most like white peas, and all of them took weeks to decide whether they really did like them or not. Peas may be what we call an acquired taste for chickens.