Analysis of information sources in references of the Wikipedia article "پرورش ماکیان" in Persian language version.
There are more chickens in the world than any other bird. In fact, more than 50 billion chickens are reared annually as a source of food, for both their meat and their eggs.
Chickens farmed for meat are called broiler chickens, whilst those farmed for eggs are called egg-laying hens.
