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Abstract
An experimental feeding trial was conducted to study the impact of different methionine sources on performance and oxidation status of broiler chickens. A total of 510 One-day-old ross (308) chicks were randomly assigned into six equal groups with 5 replicates and fed 6 experimental three stages (starter, grower and finisher) corn and soybean based basal diets that were according to the recommendations of the breed producers for 40 days. The first group (G1) was fed on basal diets with DL-M, the second group(G2) was fed on the same diets with DL-M and BHT, the third group(G3) was fed on the same diets with MHA-FA (65% BE), the Fourth group(G4) was fed on the same diets with MHA-FA (BE 65%) and BHT, the fifth group(G5) was fed on the same diets with MHA-Ca (BE 65%) and the sixth group(G6) was fed on the same diets with MHA-Ca (BE 65%) and BHT. Growth performance parameters, mortality rates were recorded. At the end of experiment serum samples were collected to determine the total protein, albumin, globulin, albumin/globulin ratio, ALT, AST, Urea and creatinine) and also samples from the homogenates hepatic tissue (liver ) and used for determination of the oxidation stress markers including reduced glutathione (GSH), malondialdehyde, MDA), catalase (CAT), glutathione peroxidase (GPx) and glutathione reductase (GR) activity. Mitochondrial activity indicators were detected. Also at the end of the experiment the carcass traits including dressing%, breast muscle yield (BMY), Thigh yield, drump stick, Wing, Neck and abdominal fat yield percentages and also organ indices including liver, heart, gizzard and proventriculus indices were calculated. In addition the gut histo- morphological picture was examined