Abstract : This study was conducted to investigate the effects of commercial probiotic mixtures (Liptosafe-L) via
drinking water of broiler chickens in comparison with Antibiotic (Newmycin) on performance of Broiler Chicks
and growth attributes. 120 broiler chicks (Ross 308) day old, and average weight of 41 grams, were subjected to
a 41-day experimental period. The chick's were randomly divided into three experimental treatment groups;
probiotic, antibiotic, and control group. Each group with four replicates (10 chicks per replicate). Birds in the
first group were supplied with 0.5 ml of probiotic per one liter of water for the whole growth period while the
antibiotic mixture is administrated at a rate of 0.20 gm per liter of water along the growth period. In these two
cases the growth promoters were stopped at 7- days before slaughtering (safety period). Birds in the control
group received water without growth promoter. Results of the experiment showed that there were significant
differences (p<0.05) in body weight gain (gm), feed conversion ratio and final body weight (gm). For Feed
intake (gm), and mortality rate (%) there is no significant difference between probiotic and antiboitic (p>0.05)
but both differ significantly if compared with control (p<0.05). Broilers fed probiotic statistically consumed
more feed over the entire experimental periods. In contrast feed conversion efficiency did not improved in
different periods in growth promoter supplemented groups compared to control birds. In conclusion the results
obtained in this study indicated that dietary inclusion of probiotic and antibiotic supported a superior
performance of chicks and can be applied as antibiotic growth promoter substitutions in broilers diet.
Hassan Ibrahim Mohammed
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