Grazing management systems for cattle in the tropics are variable due to environmental, social or economic conditions. Grazing may be during day light, at night or for 24 hours. The efficiency of animal performance is dependant upon how the animal can respond to different managements. In this work a simulation of three grazing management systems was attempted by offering forage at different times in order to study the intake of forage and of supplement (molasses block) when access to forage was restricted, but supplement was available continuously.