The broiler industry is the process by which broiler chickens are reared and prepared for meat consumption. Worldwide, in 2005 production was 71,851,000 tonnes. From 1985 to 2005, the broiler industry grew by 158%. A key measure of performance is the Feed conversion ratio (FCR), the ability to convert feed into edible product. In 2018 the FCR of broilers is about 1.5, or 1.5kg of feed of feed to produce 1 kg of meat. This compares very favorably with other sources of meat.It is estimated that broilers produce 6kg of greenhouse gas per 1kg of meat, as compared to 60kg GHG /kg for beef cattle.In the 1980s, it was typical to produce a 2 kilograms in 70 days. In 2018 it takes just 29 days to produce a bird of the same weight The "primary breeding sector" consists of companies that breed pedigree stock. Pedigree stock ("pure line") is kept on high level biosecure farms. Eggs are hatched in a special pedigree hatchery and their progeny then goes on to the great grandparent (GGP) and grandparent (GP) generations. These eggs would then go to a special GP hatchery to produce Parent Stock (PS) which passes to the production sector.In 2006, out of an estimated world population of 18 billion poultry, about 3% are breeding stock