Ok, my pullets (and that one i still think is a roo) are a bit over 3 months old (about 15 weeks) And the 2nd bag of starter just ran out. Since they have at least another month before they will lay, should i get one bag of grower type food for them them to eat (the last bag lasted about a month) before i switch them over to layer? I'm planning to get a load of feed this weekend so what do you think i should do now?