N.C. Gen. Stat. § 160A-203.1

Notwithstanding any other provision of law, no city ordinance may regulate standards of care for farm animals. For purposes of this section, "standards of care for farm animals" includes the following: the construction, repair, or improvement of farm animal shelter or housing; restrictions on the types of feed or medicines that may be administered to farm animals; and exercise and social interaction requirements. For purposes of this section, the term "farm animals" includes the following domesticated animals: cattle, oxen, bison, sheep, swine, goats, horses, ponies, mules, donkeys, hinnies, llamas, alpacas, lagomorphs, ratites, and poultry flocks of greater than 20 birds.