Authors : O. Ashayerizadeh, B. Dastar, M. Shams Shargh, A. Ashayerizadeh and M. Mamooee
Abstract: This experiment was conducted for comparison the effect of some feed growth promoter additives on carcass characteristics, internal organ weights and hematological indices of 21 days old broiler chickens. Based a randomized completely design, 300 days old Ross 308 broilers were distributed into 30 floor pens and reared for 21 days. A basal diet was formulated according to NRC recommendations for starter (0-21 days) period. The basal diet was also supplemented with antibiotic (Flavomycin), probiotic (Primalac), prebiotic (Biolex-MB) and mixture of primalac plus Biolex-MB (as synbiotic), resulting 5 dietary treatments were prepared including control group. Each dietary treatment was fed ad libitum to six replicates group of 10 birds at the bigining of rearing period. The highest (p<0.05) thigh percent was recorded for broilers fed the diet supplemented with Flavomycin, meanwhile the lower values were shown for birds fed diet supplemented with primalac. The percent of abdominal fat followed the same trend. Compared with control birds group, all other treatment groups fed growth promoter diets improved the percent of heart, but these differences were significant (p<0.05) only for biolex-MB and mixture of primalac plus biolex-MB group treatments. The percent of bursa of fabricius in primalac and mixture of primalac plus biolex-MB supplemented groups were significantly (p<0.05) higher than those in control group. The highest cholesterol concentrations were recorded for birds fed both control and diet supplemented with flavomycin groups while least concentration was found for birds fed diet supplemented with primalac.
O. Ashayerizadeh, B. Dastar, M. Shams Shargh, A. Ashayerizadeh and M. Mamooee, 2009. Influence of Antibiotic, Prebiotic and Probiotic Supplementation to Diets on Carcass Characteristics, Hematological Indices and Internal Organ Size of Young Broiler Chickens. Journal of Animal and Veterinary Advances, 8: 1772-1776.