The present Regulation shall be compulsory for pedigree and commodity poultry enterprises and incubation poultry enterprises. The formation of parent flock shall be carried out from one source-pedigree poultry farm that is free of infectious poultry disease by means of purchase of incubation eggs or day-old chicks that shall be grown on farm apart from the market flock. The formation of market flock shall be carried out by means of the reproduction of the proper parent flock. Poultry farms shall