The purpose of this study was to evaluate the feeding behavior of sheep Santa Ines in semiintensive farming system, fed concentrated and bulky. The experiment was conducted at Fazenda entanglement Latitude, 4th 45'15. 50' '5 S, Longitude 440° 00' 54 85'' The Cajazeiras in district 45 km from the city of Codó -MA. 12 aged male sheep were used at the beginning of the experiment between 4-5 months and at the end with 5-6, which were previously weighed and wormed (Allpar), divided into pasture and housed in open shed, covered with ceramic tiles and concrete floor with individual stalls of 12.00 m2 each, equipped with feeder and drinker. The mass bit and bit rate was no significant difference between treatments, and the supplementation showed a higher average (p<0.05) and the time of idling time was not significantly different between treatments with Mombasa grass grazing ( Panicum maximum cv.) and supplementation nor the treatments with supplementation and napier grass (Pennisetum purpureum) chopped, but among grazing treatments Mombasa grass and chopped napier grass and animals subjected to supplementation showed better results in the mass parameters bit and bit rate, under different types of power modifying their feeding behavior according to their nutritional needs and thus presenting better weight gain.