Document Type : Research Paper


1 Former M.Sc. Student, Department of animal Science, Faculty of Agriculture & Natural Resources, Razi University, Kermanshah, Iran

2 Assistant Professor, Department of animal Science, Faculty of Agriculture & Natural Resources, Razi University, Kermanshah, Iran


The purpose of this experiment was to investigate the effect of metabolizable energy (ME) levels, feed restriction (FR) intensity and duration in pelleted diet on performance, blood parameters and carcass characteristics in broiler chickens. A total of 480 male Ross 308 broilers were used in a 2×2×3 factorial arrangement with 12 treatments and 4 replicates. Experimental treatments included: two levels of ME, two levels of restriction intensity (90% and 85% of strain standard, intake), and three levels of restriction duration (8-21, 8-28 and 8-35d of age). Results indicated that increasing energy level improved body weight and feed conversion rate during 8-21 and 1-42 days of age, except for first week, that was decreased BW (P<0.05).  Broilers with 90% feed restriction during 8-14 and 8-21 were heavier (P<0.05) and showed higher breast weight at d 21 than those received 85% feed restriction and during 8-28 d. A 14 d of restriction with higher energy level and 90% restriction increased carcass percentage and thigh weight at 42 d, while during 21 and 28 d of restriction, higher carcass and thigh weight were observed in 85% restriction with higher energy level (P<0.01). Increasing energy level of diet induced lower TG level and breast weight, higher abdominal fat at d 42, also elevating serum glucose during 28 and 35 d of age (P<0.05). In conclusion, increasing ME level in the diet with 90% feed restriction (90% of standard intake) during 3 weeks (8-28 d) improved the growth performance of broiler chickens.


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