Insulin-like growth factors (IGFs) are hormonal proteins which share some structures with insulin but they
are different in functions. IGF system is complex and they can regulate cellular communication and response to
environmental change. IGFs are endocrine, paracrine and autocrine, they can modulate many cells and organs in
the body. IGF-I plays important role in growth and reproductive performance while IGF-II involves in quality of
pork. Using feed additives that can stimulate IGF-I production may be useful to indirectly increase growth of
piglets and enhance reproductive performance in sows.