In July I bought 6 chickens from a man who said he bred his own. They were 6 months old then. He called them Goldens. They have pink combs. I feed them Purina Layena and always have fresh water in their run & coop. They have never laid a single egg. Are there chickens who don't lay eggs? I'd quit but I spend a lot of money on the coop, feed, & equipment. What is wrong?