I purchased my chickens from TSC on April 11th. I assumed they were about 3-4 days old when I purchased them. That would put them at maybe 16 weeks of age. I figured they would start laying in about a month or so. Because of that, today I bought grower food. I came home to an EGG. Talk about excited. So..a question for the experts. Can I go ahead and feed them the grower food and supplement it with oyster shell or do I need to go exchange the food for layer pellets? The egg was a very nice shape with a hard shell. Very small but I feel like a brand new MOM.