اثر محدوديت فيزيكي خوراك در دو هيبريد تجاري از جوجه هاي گوشتي

Effect of physical feed restriction on two commercial breeds of broiler

In a factorial experiment the effect of physical feed restriction on two commercial breeds of broiler (Ross vs Arian), two sexes, two initial body weights and three level of feed restriction (0, 15, 30%)were investigated. The restricted period was from 7 to 14 days of age. There were no singnificant difference in total body weight between two commercial breeds in any of treatments (0, 15, 30% restriction), feed restriction did not change body weight in Arian chicks, whereas in Ross chicks total body weight of 30% restriction treatment were significantly less than 0% restriction chicks (p<0.05). Feed conversion did not show any significant difference between two commercial breeds in total period after restriction, the response birds to feed restriction was better than those of female. The comparison of the performance of heavy and light weight groups in the response of feed restriction showed that the total body weight of heavy birds in two level of restriction (15, 30%) had no significant difference with the control birds, wherease light weight group birds in two level of restriction (15, 30%) were not able to show compensatory growth until 56 days of age.