Using a completely randomised design, three experimental groups and a control group of lactating meat ewes, i.e. Cuban Pelibuey breed, were exposed to supplementary feeding of Leucaena leucocephala with 1.50, 1.25 and 1.0 kg of green stuff. Body weight, corporal condition and biochemical blood indicators (i.e. haemoglobin, glucose, total blood protein, albumin and urea) were monitored at different times. Ewes from the group with the highest level of legume tree consumption achieved higher body weight, excellent corporal condition and normal biochemistry blood indicators compared to the remaining experimental groups. The two experimental groups with higher legume tree supply achieved faster reproductive cycle performance. An ANOVA test confirmed the statistical significance of the group differences.