0.05) and the lowest weight gain (30.43) and the highest feed intake (72.25) were observed by 1.5% fish oil and 1.5% green tea. At 39 d, the highest level of antibody (3) was obtained by 1.5 % fish oil (P<0.05). At 32 and 39d, the levels of antibody against Newcastle was lower in 1.5% green tea (2.09 and 2.18, respectively) than 0% green tea (2.64 and 2.84, respectively; P<0.05). Therefore, the addition of 1.5% fish oil and 1.5% green tea to diet of broiler chickens increased and decreased the humoral immunity responses against Newcastle disease, respectively.]]>
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0.05). However recommended levels of vitamin E significantly improved production index at 28 days of age (P<0.05). The interaction effect of different substitution level of ESB with SBM and vitamin E supplement on feed cost at 28 days and feed cost per live weight gain at 28 and 42 days was significant (P<0.05). As increases each of them increased costs. Monetary return at 42 days of age was significant (P<0.05) and increase of monetary return was showed. It can be said that different substitution levels of ESB with SBM plus higher level of dietary vitamin E had not any negative effect on economic status and production index of broilers.]]>
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0.05), and used L-carnitine in diet significantly reduced blood cholesterol, triglycerides, LDL and VLDL (P<0.05).]]>
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p. 35−43
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0.05). Supplementing 1% benzoic acid in the diet resulted in significant decrease in body weight gain (P<0.05). Use of 0.25 and 0.5percent benzoic acid in the broilers diet in contest of control group significantly decrease FCR (P<0.05). Also inclusion of benzoic acid in the diet resulted in significant decrease breast to carcass weight ratio in 0.5percent treatment (P<0.05) but thigh to carcass weight ratio significantly increased in the treatment of 0.5 percent of benzoic acid than control group. Regarding to present results, suggested that use of 0.5 percent dietary supplementation of benzoic acid in broiler chickens is possible without negative effects on performance and carcass characteristics.]]>
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p. 53−61
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0.05), although abdominal fat pad was affected (P<0.05). The most abdominal fat was corresponded to multi-enzyme and antibiotic groups. Feeding multi-enzyme in combination with probiotic and prebiotic increased body weight of broiler up to 21 day of age but after this age the combination had no more effect than multi-enzyme alone.]]>
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