This document discusses various implants and feed additives used in livestock production. It describes different types of implants including estrogen-based, progesterone, androgen-based, and combination implants. It explains their modes of action in increasing average daily gain, feed efficiency, and carcass characteristics. The document also outlines categories of feed additives like ionophores, antibiotics, beta-agonists, buffers, and natural additives. It notes the benefits of ionophores in improving energy and protein metabolism in ruminants. In conclusion, the document emphasizes following label directions and doing research when using implants and additives.