In Expt. 1, 48 goats from two breeds (Maltese and Rossa Mediterranea) received two levels of concentrate supplements (150 and 550 g/head/d) in a 2×2 factorial design. In Expt. 2, the concentrate levels were the same, but with two CP levels for each concentrate level (150 g/head/d of concentrate: 18 and 38% CP; 550 g/head/d: 12 and 18% CP). At low or high concentrate level, the ratio of NE: CP was the same. Goats had a high preference for grasses, mainly Lolium perenne and Avena barbata, and, in summer, for forbs, especially Daucus carota, Foeniculurn sp. and Borago officinalis. Legumes were less preferred, with the exception of Vicia sativa and Lotus corniculatus. Differences between the chemical composition of pasture herbage and of ingesta were noticed. The percentage of crude fiber of the selected diet had seasonal variation opposite that of pasture. CP content of the selected pasture diet was often higher than the pasture's. The two breeds had a different behavior in selecting plant species: Maltese goats preferred grasses, while Rossa Mediterranea goats preferred forbs. Intake level was influenced by breed, by amount of concentrate and its CP content. With a high level of concentrate the Maltese reduced grass intake more than the Rossa Mediterranea (54% vs. 18%). Low level of concentrate (150 g) resulted in increased CP and quantity of herbage intake by 43 and 39% in 1987, and 17 and 15% in 1988, respectively. Low CP content of concentrates increased CP and DM intake. DM intake was positively correlated with total legumes in the pasture (0.24 ∗∗), with legumes in the diet (0.33 ∗), DM production of the pasture (0.39 ∗∗∗), and negatively, with fiber of the diet (−0.46 ∗∗∗). Several regression equations for intake were proposed.