Effect of different levels of three microbial feed additives on ostrich chick's performance

The specific aim of this study was to determine the effects of different levels of three microbial feed additives (Bioplus-2B، Yeast and Protexin) on ostrich chick’s performance that to six weeks in completely randomized design arrangement in 10 treatments، 3 replicates and 30 pens. any pen contained 5 black neck ostrich chicks. Treatments contained 3 levels of Bioplus-2B (0. 04، 0. 08، 0. 12)، 3 levels of Protexin (0. 01، 0. 02، 0. 03)، 3 levels of yeast as saccharomyces Cervisiae (0. 1، 0. 2، 0. 3) and one level of control that the latter was with out Probiotics. At the end of the study for body weight to be compared with the control، groups that consumed Bioplus 2B in 0. 04 percent and yeast in 0. 1and 0. 3 percent level had significantly highest weight. in comparison of feed consumption،results showed that group of Protexin 0. 03 percent was lessen significantly to control feed consumption. Groups of consumer of 0. 1 and 0. 3 percent yeast and 0. 04 percent Bioplus -2B have a better feed conversion ratio in relation to the control group. The results of this study have shown that the groups receiving 0. 4 percent Bioplus -2B or 0. 1 percent yeast or 0. 03 percent protexin may be recummended for improving ostrich chick’s yield.