Introduction
An improvement in pig growth performance for economic
purposes can be achieved by enhancing growth rate. The
interactions of animals with their environs, which include
food balance and quality, affect their growth rate. The effects
of these on growth rate are in turn modulated by the
endocrine system. Cysteamine (CS; mercaptoethylamine,
HS–CH2–CH2–NH2) is biologically derived from cysteine
metabolism. It can be used as a feed additive in animal
production to stimulate the endocrine system and improve