Effects of Different Levels of Organic and Inorgan

Authors: Sh Ghazi M Habibian M M Moeini A R Abdolmohammadi

Publish Date: 2011/11/30

Volume: 146, Issue: 3, Pages: 309-317

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Abstract

This experiment was carried out to investigate the effects of different levels of organic and inorganic chromium on the performance immune function and some serum mineral concentrations of broilers under heat stress condition 239–37°C cycling A total of 150 onedayold broiler chicks according to a completely randomized design were assigned into five treatment groups Each treatment consisted of three replicates and each replicate contained ten chicks Chicks were fed on corn–soybean meal basal diets with added different concentrations of chromium 0 600 and 1200 μg kg−1 chromium chloride or 600 and 1200 μg/kg chromium lmethionine from 1 to 49 days of age Humoral immunity was assessed by intravenous injection of 7 sheep red blood cell SRBC followed by evaluation of serum for antibody titers in primary and secondary responses Cellmediated immunity was assessed by the cutaneous basophil hypersensitivity CBH test to phytohemagglutinin PHAP at day 32 and PHAM at day 48 Heterophil/lymphocyte H/L ratio was also measured as a reliable indicator of stress The body mass feed intake and conversion ratio were not influenced by dietary chromium P  005 Dietary supplementation of both organic and inorganic chromium significantly increased primary and secondary antibody responses P  001 and also improved H/L ratio P  005 CBH response P  001 as well as relative weights of thymus P  005 and spleen P  001 Both dietary organic and inorganic chromium caused an increase in serum concentrations of Cr and Zn P  001 but decreased the serum concentration of Cu P  001 These results suggest that supplemental chromium especially in organic form offers a good management practice to reduce heat stressrelated depression in immunocompetence of broiler chicks

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