The study aimed at the development of a decision-aid model for the feedlot production activity. Decision trees were used to determine optimal strategy for beef cattle management during the dry season. Results showed that feeding the animals with high total digestive nutrients content rations, aiming at higher weight gains, was the best alternative available. When managers belief, with probability equal to or greater than 0.3, that the economy is in the descendent phase of the beef price cycle, them selling the feeder cattle is the best strategy.