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In this paper, we report preliminary results of a study dealing with the effect of energy (spineless cactus) or nitrogen (urea) supply on intake and digestion by sheep fed acacia-based diets. Four diets were tested according to a 4x4 Latin square design on rumen fistulated sheep (initial liveweight 47 kg). All diets included airdried acacia leaves ad libitum, 176 g DM barley, 30 g mineral and vitamin supplement (control, D1) and supplemented with 15 g urea (D2), or 300 g DM cactus (D3), or 15 g urea and 300 g DM cactus (D4). Each experimental period lasted 25 days (15 days for adaptation and 10 days for measurements). Diet digestibility was measured by total faecal collection technique. Rumen fluid was sampled before morning meal and thereafter at 2, 4 and 8 h and analysed for pH, ammonia nitrogen (N-NH 3), and volatile fatty acids (VFA). Acacia degradability in the rumen was measured by the nylon bag technique (0rskov et al, 1980, Trop Anim Prod, 5, 195213). Two grams samples of acacia (dried at 50°C and ground to pass through 3 mm screen) were introduced in nylon bags (6.5 cm x 9 cm, pore size 50 Nm). DM and nitrogen disappearance rates of incubated acacia were fitted against incubation times (4, 8, 16, 24, 48, 72 and 96 h) by the model of Orskov and McDonald (1979, J Agric Sci, 92, 499-503). Voluntary intake of acacia is low for all diets. It was not affected by urea supply (D2) but tended to decrease with cactus supply (D3). Highest intake of acacia was recorded with D4. Diet

Energy or nitrogen supply to sheep fed Acacia cyanophylla Lindl. leaves-based diets : effects on intake and digestion