Management will directly influence the decisions of how the various factors will be used and how they will affect the swine enterprise. Individuals who apply modern technology to swine production are the key in making the swine enterprise profitable. For example, the feeding program for pigs in the all-in, all-out production system, the proper timing of artificial insemination, and the timing for changing diets in the split-sex or the phase-feeding programs are decisions made by the herdsperson that can affect performance and production costs. Under optimum environment, facilities, health, and nutritional conditions, the daily and long-term management decisions made by swine personnel will greatly affect the pig's response to different feeding programs.