This study was carried out at the poultry farm of animal production Dep. College of Agriculture –University of Anbar during the period from 28/10/2021 to 8/12/2021 (42 days), to show the effect of adding Cordyceps sinensis (C.S.) extract and a probiotic in Dressing ratio, the relative weights of internal viscera and Microbial content of broilers. 210 chicks one day unsexed chicks of strain (Ross 308) were used with an average weight of 40 g, randomly distributed into 7 treatments, and each treatment containing 3 replicates (10 chicks/replicate) and treatments were as follows: T1: was a control without any addition to the diet, T2 and T3 adding C.S extract at a level of 300 and 600 mg/kg feed respectively, T4 and T5 adding a probiotic at the level of 3 and 6 gm/kg feed respectively, T6 adding of C.S extract at a level of 300 mg/kg feed + the probiotic at a level of 3 gm/kg feed, T7 adding of C.S extract at a level of 600 mg/kg feed + the probiotic at a level of 3g/kg fodder. 6 g / kg feed.
The results showed a significant superiority (P≤0.05) in the dressing percentage in treatments T2, T4, T5 and T7 compared to treatments T1 and T6, and it did not differ from treatment T3. In abdominal fat, treatment T2 was significantly (P≤0.05) superior to the rest of the treatments. There are no significant differences in the relative weight of internal viscera of the body for Fabricia, pancreas, gills, stomach, spleen, liver and heart. In the total microbial content, treatment T5 was significantly (P≤0.05) superior to all treatments and did not differ significantly with treatments T4 and T7. The results also showed a significant improvement (P≤0.05) for the numbers of lactobacilli bacteria in treatments T4, T5, T6 and T7. Compared with treatments T1, T2 and T3, the number of Escherichia coli decreased significantly (P≤0.05) in treatments T3, T5, T4, T6 and T7 compared with the control treatment T1, and it did not differ significantly with treatment T2.
We conclude from this that the addition of Cordyceps Sinensis extract and the probiotic at the above levels improved the microbial performance of the intestines, abdominal fat, relative weights of internal viscera and the dressing rate of broilers without any negative effect.