While some organic farm chicken and free range chicken live by eating grass and insects, most chicken need feed to survive and produce egg and meat. As a matter of fact, feed is one of the costliest things in raising chicken. Today feed is produced in feed factories. Those factories employ a lots of people. There are specialized stores where farmers can buy all types of feed for chickens. They are called feed stores. Here are some people involved in production and sale of chicken feed.

sale clerks
nutritionists ( understands what chicken need to eat to produce well)
chemists
biologists and poultry scientists
marketing and advertising
managers
janitors