Poultry farming is defined as ‘raising different types of domestic birds commercially for the purpose of meat, eggs and feather production’. Though, the most common and widely raised poultry birds are chicken. Around 5k million chickens are being raised every year as a source of food (both meat and eggs of chicken). The chickens raised for eggs are called as layer chicken, and the chickens which are raised for their meat production are called broiler chickens.