Before the development of modern commercial meat breeds, broilers were mostly young male chickens culled from farm flocks. Pedigree breeding began around 1916.^[3] Magazines for the poultry industry existed at this time.^[3][4] A crossbred variety of chicken was produced from a male of a naturally double-breasted Cornish strain, and a female of a tall, large-boned strain of white Plymouth Rocks.^[5] This first attempt at a meat crossbreed was introduced in the 1930s and became dominant in the 1960s.