Abstract
The objective of this study was to find out the effect of adding the probiotics to the diet in different concentration on productive performance of broiler. 200 of unsexed chickens (Cobb) one day old were used in this study .Chicks raised on standard condition to the age of marketing six weeks (42) days. Four treatments were used as follows: T1 Control No probiotics added. T2 addition of 2 Kg probiotics Ton of diet, T3 addition of 4 Kg probiotics / Ton of diet, T4 addition of 6 Kg probiotics Ton of diet, Feed and water were Ad Libitum. Statistic analysis showed that adding probiotics resulted in significant increase P ≤ 0.5 for life body weight, average weekly weight gain for treatment 3 and 4 (Adding 3,4Kg probiotics Ton of diet) and significant decrease P ≤ 0.5 in feed consumption, feed conversion ratio and mortality. Data showed no significant differences P ≤ 0.5 in relative growth rate and dressing percentage.
