الفهرس 
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Abstract
The current study aimed to evaluate the effects of treatment of weaning rabbits with Saccharomyces cerevisiae from 4-10 weeks of age on growth performance and digestive system development. A total of 60 NZW rabbits at 4 weeks of age were used. Rabbits were assigned to 4 treatment groups (15 in each) during December 2017 to February 2018. Rabbits in 1st group were fed basal diet and served as control group (C), while, Rabbits in 2nd , 3rd , and 4th groups were fed basal diet supplemented with 100, 200 and 400 gm SCB/ton diet (R1, R2 and R3).
Resulted revealed that final live body weight and daily weight gain were increased significantly (P≤0.01) for rabbits fed treated diets, and growth rate was significantly (P≤0.05) improved comparable with control. Feed intake was decreased while FCR was improved for rabbits fed treated diets. Hot carcass weight% and dressing% were increased significantly (P≤0.05) in rabbits fed diet supplemented 400 gm SCB/ton (R3) by 29.3% comparing to control group. Gastro-intestinal tract (GIT) length and caecum length were increased in rabbits fed basal diet supplemented with SCB compared to control group. Addition a pelleted basal diet with 200 or 400 gm SCB/ton diet due to decrease in the pH of caecum compared with those fed 100 gm SCB/ton diet and control group. Addition SCB was decreased total cholesterol significantly (P≤0.05) comparing with the control group. Best economical efficiency was obtained in rabbit’s fed 400 gm SCB/ton diet.