Document Type : Research Paper

Authors

• Akbar Shiralinezhad ¹
• Mir Daryoush Shakouri ²
• Seyedeh Azam Khatami ¹

¹ M.Sc., Department of Animal Science, Faculty of Agricultural Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

² Assistant Professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract

This study was conducted to investigate the effect of dietary soy isoflavones (ISFs) on growth performance, blood parameters and tibia Ca and P content of broiler chickens. A total of 240 as-hatched day-old Ross 308 chicks were used in a completely randomize design with four treatments (0 (control), 25, 50 and 100 mg/kg of ISF), three replicates and 20 birds per each replicate for a period of 42 days. Using ISF in the diet without any effect on feed intake improved the chicken’s weight gain and feed conversion ratio (P<0.05). Diet containing 50 and 100 mg ISF/kg had no effect on tibia ash content, but increased tibia Ca and P contents (P<0.05). pH value of gizzard and cecal digesta were decreased by adding ISF to diet (P<0.05). The sera concentrations of total cholesterol, triglyceride, LDL- and VLDL-cholesterol decreased in birds fed on diets containing ISF (P<0.05), whereas the concentration of HDL-cholesterol increased (P<0.05). Addition 50 and 100 mg/kg of ISF to diet increased the gross profit per chicken and cost of diet, respectively (P<0.05). According to the findings, supplementation of 50 mg ISF/kg of broiler diet is recommended.

Keywords

• bone calcium
• digesta pH
• economic efficiency
• Genistein
• serum cholesterol

20.1001.1.20096776.1395.18.1.7.6