I got my pekins last may, so they are way over 18 weeks old, and Layena is suppossed to be used once they reach that age. Layena and flock raiser are from purina and is the only brand the store carries. when the ducks turned 18 weeks old, i asked for Layena. the lady said no. that flock raiser was better for them. i responded saying that they were over 18 weeks old and needed layena. she refused and went and got the flock raiser. ever since, the store refuses to give us layena! i say i need purina mills layena sunfresh recipe and they respond with "no, it says on the computer you get flock raiser." i try to explain how we need layena now, not flock raiser, and they always say no! i know they have it because i have gotten it once and i can see it outside in the stacks they have. why won't they give it to me and will it hurt my ducks to give them flock raiser instead since thats all we get?