HI I have 4 rhode island reds and 4 brahmas. They were all hatched March 18th and I still haven't got one egg! We have a good sized coop, one rooster, I've been giving them laying feed for several weeks, and have been giving ouser shells for the last week. We haven't got any eggs... at this point with it getting colder I'm not sure if we will get any until spring! Any advice?