تاثير برنامه هاي مختلف محدوديت غذايي بر عملكرد جوجه هاي گوشتي

The Effect of Different Feed Restriction Regimens on Broiler Performance

An experiment was conducted to investigate the effect of different feed Restriction on broiler performance and carcass quality during second/third week of life. A 2 x 3 x 2 factorial experiment added a control was used, that the strain of broilers, severity and duration of feed restriction were considered as the main effects. Every treatment had three replicate. Totally in this experiment were considered 840 broilers unsexing Arian and Ross broilers (420 chicks of every strains). The feed restricton with 0, 30, 40 and 50% severities was begun at 8d of age, and depending on restriction duration (7 or 14d) continued until 14 or 21d of age. Then broilers fed to 56d of age ad-libitum. The varied feeding restrictions, had no effect on final body weight Arian broilers, but in Ross broilers with 30% less of ad - libitum in 7 or 14 days Resulted in a increasing body weight (P<0.05) comparation of the control Ross broilers. The varied treatments of feeding restriction had no effect on feed conversation ratio in two strains. Carcass characteristics in two strains were similar to control chicks. Abdominal fat percent decreased in the treatment of 30% feed restriction for 14d in the Ross broilers (P<0.05), and in the other treatments didnʹt change.