The female lines from birds of White Rock background and the male lines are from the birds of Cornish ancestry. Hybrid vigour in next generation is obtained by systematic mating that may involve the crossing of different birds as stated, may be among different strains of same bird or in breed lines. The end product of all well planned selected crosses should be to produce a chick which will be white in color, yellow sanked, grows faster than either of the parents with tender meat and flexible breast cartilage.
