In this chapter:
(1) "Cooperative association" means any group in which farmers act together in the market preparation, processing, or marketing of farm products or any association organized under Chapter 52 of this code.
(2) "Dairy farmer" means a farmer engaged in the business of producing milk for sale to milk processors directly or through a cooperative association of which the dairy farmer is a member.
(3) "Milk processor" means a person who operates a milk, milk products, or frozen desserts processing plant that is located in Texas.
(4) "Purchase price" means an amount of money, based on estimated butterfat content at the time of delivery, that a milk processor agrees to pay a dairy farmer for a purchase of raw milk.