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In the 1910s it was reported that Egyptian poultry farmers used these incubators to produce over 90,000,000 chickens per year. [ 14 ] In 2009 the Food and Agriculture Organization published a survey of the traditional hatcheries in three of the Governorates of Egypt , in an attempt to assess risks of Avian influenza in the country.
The incubator is recorded being used to hatch bird and reptile eggs. It lets the fetus inside the egg grow without the mother needing to be present to provide the warmth. Chicken eggs are recorded to hatch after about 21 days, but other species of birds can take a longer or shorter amount of time. [10] Incubators are also used to raise birds. [11]
Mass production of chicken meat is a global industry and at that time, only two or three breeding companies supplied around 90% of the world's breeder-broilers. The total number of meat chickens produced in the world was nearly 47 billion in 2004; of these, approximately 19% were produced in the US, 15% in China, 13% in the EU25 and 11% in Brazil.
In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them. The incubation period is divided into three phases.
Live weight price 36 cents per pound (1948) 39.3 cents per pound (2001) ... In 2001, there were 323 chicken hatcheries, with an incubator capacity of 862 million eggs ...
A chicken coop from the 1950s. An early reference to battery cages appears in Milton Arndt's 1931 book, Battery Brooding, where he reports that his cage flock was healthier and had higher egg production than his conventional flock. [10]