An experiment was conducted to determine appropriate levels of energy, protein and fiber in the diet of New Zealand White growing rabbits fed on green forages available in North Vietnam. A total of 135 growing rabbits at 8 weeks of age (0.93 +/- 0.01 kglhead) were randomly divided into 27 groups of 5 each corresponding to 27 diets based on fiber rich grasses (elephant, setaria or para grass), protein rich foliages (water spinach vine, sweet potato vine or gigantea leaves) and others common feed (maize, paddy, broken rice and rice husk). The diets were formulated according to a 3x3x3 factorial design to accommodate 3 ME levels (1920, 2135, 2350 kcal/kg DM), 3 CP levels (14.9 percent, 16.6 percent, 18.3 percent DM) and 3 ADF levels (20,0 percent, 22,2 percent, 24,4 percent DM). Results showed that, the energy level of 2135 and 2350 kcal/kg OM increased ME, CP and AOF intakes (by 3.1 percent, 1.7 percent and 20.3 percent), increased OM, CP and AOF digestibilities (by 3.1 percent, 1.7 percent and 20.3 percent, respectively). However, slight reduction of carcass and loin percentage were found at high energy level (2350 kcal/kg OM). Medium protein level (16.6 percent) provided highest AOG and best FCR. CP levels had no effect on carcass and foreleg percentage (P0,05) but has significant effect on hindleg and loin percentage (P0,05). Medium fiber level (22.2 percent) provided best AOG, FCR and digestibility. There was no significant effect of AOF on carcass characteristics. As a result, appropriate diet is formulated at medium and high ME (2135-2350 kcal ME/kg OM), medium protein (16.6 percent OM) and medium AOF (22.15 percent OM) levels.
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