An experiment was done aiming to abate the green house gas emissions by supplementing Tra fish oil in diets of growing cattle at Hoa An Research Center of Can Tho University. It was a 4x4 Latin square design with 4 growing Lai Sind cattle around 180 ± 11.2 kg (X±SE) and four treatments were the rice straw and concentrate (1), rice straw, concentrate + 1% Tra fish oil (2), rice straw, concentrate + 2 % Tra fish oil (3) and rice straw, concentrate + 3% Tra fish oil (4) corresponding to the TFO0, TFO1, TFO2 and TFO3 treatments. In all the treatments the rice straw will be fed ad libitum, while concentrate (16 % CP and 3000 kcalME/kgDM) was fed at a level of 1 kg per 150 kgLW. The results showed that there was a linear relationship between methane production (L CH4/kgDMI) reduced when increasing the Tra fish oil in the diets of cattle with R2 = 0.892 (y= -0.93x +31.27, P=0.05, SE=0.51) and the CH4 production was significantly different.