An experiment was conducted to study the effects of different levels of protein in the diet over the reproductive capacity of heavy broiler breeder males, fed separately from the Females on tropical commercial conditions. Ninety six Avian Farm males were assigned to either 10, 12, 14 or 16% protein diet (isocaloric) from 20 to 64 weeks of age, and all groups received equal quantities of feed (130g/day). The 16 % protein diet served as control treatment. Corporal condition (body weight, and foot pad score), semen quality (volume, density, motility spermatozoa per ejaculated and pH), total eclosion (fertility and hatchability of egg) were evaluated during 10 periods, each one of 28 days. The results showed that protein treatment had no significant effects on body weight (4,584, 4,502, 4,547 y 4,733 for 10, 12, 14 and 16% protein) and semen quality (volume, density, motility, spermatozoa per ejaculated and pH). Foot pad score showed significant (p<0.01) differences among treatments. Foot pad score was lower for the treatment of 10% and greater for the 16% of protein (1.417 and 1.621). Total eclosion presented difference statistics, fertility (p<0.05) and hatchability (p<0.01), between the treatments, favorable to treatment of 16% of protein but similar to that of 10% (95.61 vs 94.54) and (90.12 vs 88.53), respectively. Results from this broiler breeder study indicated that males can be fed 10% of dietary protein on a restricted basis with no adverse effects on body weight and semen quality, but it affects highly the total eclosion and food pad score.