My girls are a year old, Red Sex Links, they've already started to molt. my standard feed is a blend of 16% layer feed and a 22% super breeder. Oyster shells and grit is always available. I've upped their daily ration of BSS, so far no real egg production loss. When they were locked up in the coop, during the hurricane, I had a feed block, which I removed after, since it was the only thing they were eating.