The study was designed to evaluate the effect of feeding ad libitwn the mixing of fresh stylo 184 and Panicwn maximum grass diet (with ratio of 1:3) for growing cattle of Sind breed and F1(LS x Br). The results of study showed: 1) Supplementing stylo 184 to the diet with only fresh grass improved the feed intake 22 - 23 percent compared to the diet only grasses
2) The body weight gain of Sind cattle that fed add libitum only grass was quite high (648.11 gram/day) and significant higher than F1(Br x LS) with the same diet, while feeding cattle by mixing grass and legume with ratio 3:1 the body weight gain of crossbred F1 (Br x LS) was higher
3) The body weight gain of both cattle groups in the treatment of add libitum mixing of stylo and grass was much higher than those if feeding only grass (765 gram/day/head with Sind cattle and 789 gram/head/ day with F1 (Br x LS)
4) The cost for producing 1 kg of body weight gain of growing cattle was low (VND 14,000 - VND 16,900) compared to it's price in the market (VND 35,000 - VND 40,000).