This study was carried out at the farm of the College of Animal Production of Science and Technology, Sudan University of Science and Technology at Hillat Kuku. The experiment was conducted to evaluate the effect of replacement of Sorghum with Millet and its effect on cockerels’ performance included: Feed consumption, body weight gain, feed conversion ratio (FCR) and mortality. A total of forty (Bovans White Strain) commercial hybrid broiler cockerels in age sixteen weeks old in this study were used. The cockerels were randomly distributed in 4 treatments experimental groups; each group has 3 replicates of 10 chicks. Millet replaced sorghum: 0% - 20% - 40% - 60% in group a, b, c and d respectively. The results showed that there is no significant difference among experimental groups on cockerels’ performance, live weight, body weight gain, or feed conversion ratio among the experimental treatments when replaced the Sorghum by Millet. The adding of millet did not show any negative effect in the stock health and there is no any mortality throughout the experiment period. The results also did not show statistically significant in Thyroxine (T₄) level in blood data among the treatments. In conclusion, additions of millet and sorghum-based diets of broilers do not compromise cockerels’ performance