Dual purpose chicken breeds are exactly that. They serve two purposes. They typically have a great egg laying rate and are large enough birds to be used for meat when they are past their egg-laying prime. Most hens will lay solid for approximately two to three years. After that, their laying rate slows to about one egg a week until they stop laying completely. Dual purpose chicken breeds are our favorite chickens! First, peruse the list below and determine which breed will meet your needs.