I have a conundrum. I have only 3 chickens, so they don't eat a lot, and of course feed comes in 40-50 lb bags. They are black australorps, and so far they aren't showing any signs of laying any time soon and have small combs. What type of food should I buy to feed them for the next 2-3 months?? Should I buy layer feed, or just buy grower feed and give them extra calcium when they get close to laying?