TY - JOUR ID - 2661 TI - Comparison of growth performance of six commercial broiler hybrids in Iran JO - Iranian Journal of Veterinary Research JA - IJVR LA - en SN - 1728-1997 AU - Rahimi, Sh. AU - Esmaeilzadeh, L. AU - Karimi Torshizi, M. A. AD - Department of Poultry Sciences, College of Agriculture, Tarbiat Modarres University of Tehran, Tehran, Iran Y1 - 2006 PY - 2006 VL - 7 IS - 2 SP - 38 EP - 44 KW - Broiler KW - Performance KW - hybrids DO - 10.22099/ijvr.2006.2661 N2 - An investigation was carried out to evaluate the growth performance of six commercial broiler hybridsavailable in Iran (Arbor Acres, Arian, Cobb 500, Hubbard, Lohmann and Ross 508). Two hundred and fiftyfertile eggs of each hybrid were taken from different breeder farms, all over the country. The similarity offlocks ages and their health conditions were considered. After hatching, the sexed chicks were randomlyassigned to six replicates of floor pens of 17 chicks, except the male Cobb hybrid which had five replications.All groups were managed in a similar way throughout the 56 days of study. Daily feed intake (FI) and dailybody weight gain (BWG) were measured on weekly basis and the European production index (EPI) werecalculated at 49 and 56 days of age. There were no significant differences among hybrids in FI during starterand grower periods (P>0.05), although significant differences were observed in finisher period (P<0.01).Differences in daily FI were significant between male and female chicks in grower and finisher periods(P<0.05), but not in starter period. Differences in daily BWG were significant among hybrids throughout theexperiment (P<0.01). Sex significantly affected the daily BWG in all periods (P<0.01). The calculated EPIshowed significant differences for both 49 and 56 days of age among hybrids and between two sexes(P<0.01). There were no significant differences among hybrids in carcass yield, percentage of breast andabdominal fat to carcass weight at 42 and 56 days of age. On day 42, males had more percentage of carcass and breast yield compared with females (P<0.01). Percent of abdominal fat in females on day 56 was more than that of the males (P<0.01), while on day 42 no significant differences were found in this respect. UR - https://ijvr.shirazu.ac.ir/article_2661.html L1 - https://ijvr.shirazu.ac.ir/article_2661_8da864c80461aa2f5de1abd22351a6dd.pdf ER -