The swine industry is re-emphasizing the importance of efficiently developing a quality product. to fulfill this objective, market hogs will need to come from larger litters and convert feed into lean meat more efficiently. for this to occur in your herd, favorable genetic change needs to be made in those traits that effect efficiency of production. Therefore, pork producers need to understand basic genetic concepts so that they can apply them to improve economically important traits. This document is one of the more than 270 articles that are part of the Pork Industry Handbook.