This experiment aims to measure the biological parameters of native cattle for beef production when Erythrina leaf and Cassava leaf diets were added with common basal diet of urea-treated rice straw. The hypotheses to be test were that: the feed intake and growth performance were responded to Erythrina leaf and Cassava leaf hay supplements, when they were added following treatments during three months of experimental time. Twelve native cattle of about 80±10 kg of body weight were housed in individual pens and allocated in Randomized Completely Block Design. The major treatments were Erythrina 0g + Cassava 500g (T1), Erythrina 500g + Cassava 500g (T2), Erythrina 0 g + Cassava 1000g (T3), and Erythrina 500 g + Cassava 1,000 g (T4). All treatments were mixed with 0.5 kg molasses and cattle were normally fed with urea treated rice straw as basal diet. Feed intake and biological body weight were measured and data basis were analyzed of variance by using in Genstat program. Pair wise comparisons of means were made with the DUNCAN method. It was found that, average daily gain (ADG) in T1 (263.90g/head/d) was better tendency comparing with the other treatments (P>0.05) and body weight gain in treatment 1 (15.83 kg/head) was better than T2, T3 and T4: 6.00, 8.00 and 5.00 kg/head, respectively. However, supplement intake and CP supplement intake were highest in T4 (155.61 and 30.02kg DM/head, respectively) comparing with 3 treatments as T1, T2, and T3: 50.21 and 10.60 kg DM/head, 70.72 and 14.94 kg DM/head and 63.38 and 14.70 kg DM/head, respectively (P<0.0001). Thus supplemented feeds were not effective on biological growth performance in this experiment and recommended that we should consider on feed quality and storage because it has affects on the results.

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