تاثير سطوح مختلف كروم آلي بر عملكرد، پاسخ هاي ايمني و مولفه هاي خوني جوجه هاي گوشتي

چكيده انگليسي :

Effect of Different Levels of Supplemental Organic Chromium on Performance Immune Responses and Blood Parameters in Broiler Chicks Ehsan Pouladi ehsanpouladi@yahoomail com Date of submission 2011 3 8 Department of animal science Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors A H Samie asamie48@cc iut ac ir R Jahanian r jahanian@cc iut ac ir Abstract This study was carried out to evaluate the effects of different levels of organic chromium on performance blood metabolites and immune responses of broiler chicks 325 one wk old broiler chicks Ross 308 were randomly allocated to five dietary treatments with five replicates in a completely randomized design Treatments included dietary levels of 0 control 500 1000 1500 and 2000 ppb Cr from Cr Methionine Chicks were fed a commercial diet cp 21 ME 2900 kcal kg 1 for a week before experimental period After that birds received starter 7 21 days and grower 21 42 days diets Weight gain feed intake and feed conversion ratio were measured periodically At the age of 10 days birds received Newcastle disease vaccine orally 6 and 12 days later blood samples were collected from the wing vein of two birds per replicate Serum antibody titers against Newcastle virus were determined by beta HI test and expressed as log2 Also at 28 and 35 days of age two birds from each pen were immunized intraperitoneally with 0 5 ml of 10 SRBC sheep red blood cell suspension to determine primary and secondary humoral antibody responses 7 days after each injection blood samples were collected from the birds to evaluate antibody titers against SRBC Antibody titers against Newcastle virus at 16 and 22 days and SRBC at 35 and 42 days were evaluated At 22 and 42 days blood samples were collected to investigate serum total cholesterol HDL cholesterol and TG concentrations At the end of experiment two birds from each replicate were slaughtered and then Carcass liver heart pancreas as well as lymphoid organs including spleen and bursa of fabrecius were weighted and expressed as a percentage of live body weight Experimental data were analyzed as a completely randomized design by ANOVA using the GLM procedure of SAS institute This study showed that feed intake weight gain feed conversion ratio carcass traits and lymphoid organs were not affected by treatments Antibody titers against Newcastle at 16 and 22 days showed not significant differences among treatments SRBC titers tended to be significantly different among treatments at 35 days P 0 0747 but significantly affected by treatments at 42 days P 0 05 and broilers fed 1500 ppb Cr showed the highest antibody titer Serum total cholesterol tended to be significantly reduced by Cr supplementation at 22 days P 0 0511 and chicks fed 1500 ppb chromium showed the lowest total cholesterol concentrations However cholesterol concentration was not significantly affected by chromium at 42 days TG concentrations were significantly different between treatments at 22 days p 0 05 and chicks fed 1500 ppb chromium showed the lowest TG concentration Also groups fed dietary chromium showed lower TG than control group at 42 days P 0 05 However HDL concentrations at 22 and 42 days were not affected by chromium supplementation The results of present study showed that chromium improved some immune responses and led to some changes in serum lipid profile but it had no effects on performance carcass traits and lymphoid organs of broiler chicks Keywords Broiler Chromium methionine Cr Met Performance Immune responses Total serum cholesterol

پولادي، احسان

تاثير سطوح مختلف كروم آلي بر عملكرد، پاسخ هاي ايمني و مولفه هاي خوني جوجه هاي گوشتي

كروم-متيونين , كسترول تام سرم