1. “Livestock dealer, livestock market operator, or stockyard operator” means any person engaged in the business of buying for resale, or selling, or exchanging swine as a principal or agent, or one who claims to be so engaged, but does not include the owner or operator of a farm who does not claim to be so engaged, and who sells or exchanges only those swine which have been kept by that person solely for feeding or breeding purposes.
 2. “Person” means a person as defined in section 4.1, subsection 20.
 3. “Slaughtering establishment” means any person engaged in the business of slaughtering live animals or receiving or buying live animals for slaughter.
 4. “Stag” means a male swine that has formerly been used for breeding purposes but that has subsequently been castrated.