Two experiments were conducted to compare feeding behavior in the free choice of 3 kinds of oil supplemented diets, and in 2 kinds of oil supplemented diets in beef cattle. Of the two groups, the first group received approximately 6 kg/d of concentrate as a basal diet, whilst the other was a free choice group which was fed the same quantity of basal diet as the control, but 1 kg basal diet was supplemented with 35 g per meal of corn oil (CO), palm oil (PO), and rice bran oil (RO) respectively by top dressing. The 2
nd
experiment was conducted using the same animals as in the 1
st
experiment with the 1
st
group (control) receiving approximately 3 kg of concentrate per meal as a basal diet together with 0.5 kg of cassava pulp, while the 2
nd
(RO) and 3
rd
(PO) groups being fed the same basal diet supplemented with 100 g per meal of RO or PO, respectively. Results of the free choice test showed that the DMI of CO significantly decreased during the final 3 weeks of feeding (
p