Studying of performance of five broiler strains with their catalogs in Alborz

Iran has production capacity about 820 Million commercial poultry in a year. For this reason، poultries develop various strains. The production companies register their records namely performance. This study was carried out to comparison conformity of performance in five broiler strains (Arbor Acerse، Arian، Lohman، Cobb500 and Ross 308(with their catalogs). In this trial was used 400 chickens from Five strains that were allotted in randomized completely design. Weight body chickens، feed intake and feed conversion were compared with their catalogs at end of per periods. Body weight and feed intake were significant different to catalogs in 28، 42 and 45 days (P<0. 05). Related to trait of body weight in 28 days the most and the least conformity whit their catalogs belonged to respectively to Arian and cobb، and in 42 and 45 days the most and the least conformity belonged to respectively to Arian and Ross. The most conformity with catalogs about feed intake in 28، 42 and 45 days belonged to respectively to Lohman، Arian and Arbor Acrse.