An experiment was carried outusing three hundred and sixty (308 Ross) 1-d-old broiler chick. In the pre starter phase (0-7d) birds were randomly divided into three experimental groups 120 chicks each,with 3 replicates (40 birds/ pen) and fed diet (ME; 2950 kcal/kg, CP; 24%). as suggested by the Ross guided 2018. Dietary additives were consisted of: (i) basal diet without supplementation of additives (control); (ii) basal diet supplemented with 0.05% omega3 (iii) basal diet supplemented with 0.5% yeast. Results showed no significant differences among different groups, regarding; in live body weight, body weight gain, feed intake and feed conversion. Data ofvillus height (um), villus width (µm) crypt (um), villus height to crypt depth ratioand number of villus of broiler chicks at 7 day-oldsdid not reveal any significant difference among all studied experimental groups however, the addition of yeast lead to anumerical increase in villus height and villus height to crypt depth ratio. In addition, microbial counts showed increase numbers of Lactobacillus only in yeast feed group. Both omega-3 and yeast increased the viability of chicks compared to the control. In conclusion, early nutrition of yeast at level of 0.5% could have the beneficial effect on productive performance and related traits to avoid frequent administration of traditional antimicrobials.