Evaluation of the effects of tomato pomace, herbal oil sources and tallow on blood lipids, plasma enzyme activity and antioxidant system of heat stressed broiler chickens

This experiment was conducted to evaluate the effects of tomato pomace (TP)، herbal oil sources and tallow on blood lipids، enzyme activity and antioxidant system of heat stressed broiler chickens. Seven hundred ninety-two one-d-old Arian broiler were randomly to 36 experimental units in the 9 dietary treatments (4 replicate with 22 birds each). The completely randomized design with factorial arrangement 3×3 (3 oil kinds: canola، soybean، tallow and 3 TP levels involved 0، 3، 5%) were used. The daily heat stressed schedule (33oC for 5 h) was applied from 29-42d. Canola and soybean oils decreased serum triglyceride and cholesterol in pre heat stressed (PHS) birds. In heat stressed (HS) birds، canola enhanced the HDL as compared to tallow diets. TP decreased the triglyceride، cholesterol and LDL and improved HDL. The oil type did not affect the enzyme activity of AST، ALT، ALP، LDH، CK and lipase in PHS and HS birds. The canola oil decreased the LDH in PHS and ALP and AST in HS birds. TP decreased the activity of ALP، AST، ALT and CK in PHS and HS birds. Tallow diet increased and decreased the GPx activity in PHS and HS respectively. Tallow and TP decreased TBARS index. The enzyme activity of GPx and SOD were enhanced by inclusion of TP. The oil kind and TP did not affect hematology parameters with the exception of H: L ratio. It is concluded that inclusion of canola oil and TP might decreased blood lipids، dehydrogenase enzyme activity and antioxidant system of heat stressed broiler chickens.