Birds and reptiles also lay eggs. N.C. State University researcher Mary Schweitzer discovered a medullary bone in the leg of a Tyrannosaurus rex. Birds use this bone to store extra calcium for egg production [source: Fields]. Researchers have found fossilized eggs in locations around the world...
Second you must consider the product you wish to offer Free range meat Meat for a specialty market Meat and eggs from one flock Eggs Eggs of a particular color Eggs come in many colors: white, brown, terra-cotta, chocolate, blue and green Then it is time match a breed with your market...