تاثير چند افزودني غذايي محرك رشد بر عملكرد، تركيب لاشه و مقادير هماتولوژي جوجه هاي گوشتي

Effect of several growth promoter additives on performance, carcass characteristics and hematological values of broiler chicks

This experiment was conducted to determine the effect of Roxarsone, Avilomycin and Formycine gold on performance, carcass characteristics and hematological values of Ross 308 male broiler chicks in a completely randomized design. For this purpose, a control basal diet formulated according to NRC (1994) recommendations for starter (0-21d) and grower (22-42d) periods. Growth promoter additives including Roxarsone (200mg), Avilomycin (I OOmg), mixture of Roxarsone and Avilomycin (200 and 100mg, respectively), and two levels of Formycine gold (500 and 2000g) was supplemented to each Kg of the basal diet for preparing other treatments. Therefore, there were six dietary treatments. Each dietary treatment was fed ad-libitum to five replicate groups of 18 birds. The results of experiment indicated that supplementing of all feed growth promoters except for 500mgIKg diet Formycine gold, improved broiler performance. Broilers were fed diet containing mixture of Roxarsone and Avilomycine had higher weight gain than control diet. Carcass and tight percentage was significantly influenced by supplementing Avilomycin and Formycine gold (0.05%), respectively (P<0.05). All growth promoter additives, especially Formycine gold (0.05%) significantly decrease serum cholesterol concentration (P<0.05), but had no significant effect on other blood parameters. Supplementing of Avilomycin or mixture of Roxarsone and Avilomycin resulted to decrease of crop pH. Based on results of this experiment, supplementing of Roxarsone, Avilomycin and their mixtures to broilersʹ diet improve weight gain and decrease meat yield cost.