EFFECT OF FEED RESTRICTION WITH SUPPLEMENTATION OF PROBIOTIC WITH ENZYMES PREPARATION ON PERFORMANCE, CARCASS CHARACTERISTICS AND ECONOMIC TRAITS OF BROILER CHICKENS DURING FINISHER PERIOD

The objective of this study was to investigate the response of broiler chicks to feed restriction at finisher period (5-6 weeks) of age and supplementation of (probiotic + enzymes preparation) on performance, carcass characteristics and economical traits. A total number of 180 Hubbard broiler chickens 5 weeks of age were weighed and divided into six dietary treatments of 30 chicken each with 3 replicates (10 chicken in each), in 2 x 3 factorial design as follow: T1: Chickens fed basal diet ad-libitum without supplementation, T2: Chickens fed basal diet ad-libitum + Zado® (0.5 Kg/ ton), T3: Chickens fed basal diet ad-libitum + AmphiBact® (0.5 Kg/ ton), T4: Chickens fed (T1 diet), restricted for 6 hours / day, T5: Chickens fed (T2 diet), restricted for 6 hours / day, T6: Chickens fed (T3 diet), restricted for 6 hours / day. The results indicated that: Productive performance of broiler chicks including live body weight (LBW); daily weight gain (DWG); feed conversion ratio (FCR), performance index (PI), production efficiency factor (PEF), protein conversion ratio (PCR) and energy conversion ratio (ECR) were not affected significantly by feed restriction (R), feed supplementation, (F) and interaction (R*F) at experimental period (5-6 weeks of age). Daily feed intake (DFI) recorded a significant response due to feed restriction only. Carcass characteristics (edible parts, inedible parts, carcass cuts and drumstick traits) indicated that (R), (F) and interaction (R*F) had no significant effects except dressed carcass and neck percentages. Economic evaluation showed that, chicks fed diet supplemented with (Zado®, 0.5 Kg/ ton) in either ad-libitum or restricted regime had the best relative economic efficiency (REE) and mean economic efficiency of all restricted-fed groups, increased (REE) by 3.4% as compared with the corresponding values of the ad-libitum groups. Based on the experimental results, it is concluded that supplementing broiler chicks under ad-libitum or restricted-fed regime with (Zado®, 0.5 Kg/ ton) could be better approach to improve relative economic efficiency during finisher period.