The study was carried with the objective to evaluate the effect of the sex upon the weight gain, dry matter intake and food conversion of feedlot lambs and slaughtered at one hundred days of age. Eighteen lambs (six whole males, six castrated males and six females) descendents of a Texel male with (Texel x Ideal) female sheeps, were used. The animals (sheeps + lambs) were confined in individuals bails 24 hours after delivery until the weaning at the 50 days. After, they remained along until the slaughter at the age of 100 days. The food used was corn silage + concentrated (corn + soybean meal + minerals), in the proportion 58:42 in dry matter. The values obtained for weight gain, dry matter intake (kg/animal/day), % live weight and g/metabolic size and food conversion, did not differ (P>0,05) among the sex of the lambs. The results obtained showed that whole males lambs, castrated males lambs and females lambs, present performance similar at the age of 100 days.
confinement; food conversion; sex; sheeps; weight gain
