An experiment was done aiming to abate the green house gas emissions by supplementing Tra fish oil (TFO) 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 (180 ± 11.2 kg) and four treatments were the rice straw and concentrate (1), rice straw, concentrate + 1% TFO (2), rice straw, concentrate + 2 % TFO (3) and rice straw, concentrate + 3% TFO (4) corresponding to the TFO0, TFO1, TFO2 and TFO3 treatments (dry matter [DM]). In all the treatments the rice straw was fed ad libitum, while concentrate (16% crude protein and 3000 kcal metabolizable energy/kg DM) was fed at a level of 1 kg per 150 kg live weight. The results showed that there was a linear relationship between methane production (L CH₄/kg DM intake) reduced when increasing the TFO in the diets of cattle with R² = 0.892 (y= -0.93x +31.27, P=0.05, SE=0.51) and the CH₄production was significantly different