5675

5297

كارشناسي ارشد

علوم دامي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1389

دوازده،110ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

رحمان جهانيان، عبدالحسين سميع

محمد علي ادريس

11/12/89

امير حسين مهدوي، اميرحسين گلي

مهندسي كشاورزي

ID5297

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effect of Supplemental Organic Chromium and Vitamin C on Performance Blood Parameters and Egg Quality of Laying Hens Subjected to High Stocking Density Seyed Ehsan Mirfendereski Ehsanmir87@gmail com October 30 2010 Department of Animal Science College o Agriculture Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Rahman Jahanian r jahanian@cc iut ac ir Abdolhosein Samie asamie48@cc iut ac ir Abstract The present study was performed to investigate the effects of dietary supplementation of chromium methionine Cr Met and or vitamin C Vit C on performance blood parameters egg quality and stress status of laying hens subjected to high stocking density A total of 360 Hy line W 36 leghorn hens of 28 wk old were used in a 3 2 2 factorial arrangement including 3 levels of Cr 0 500 and 1000 ppb as Cr Met 2 Vit C levels 0 and 500 ppm and 2 cage densities 5 and 7 hens per cage After a 10 d adaptation period the main recording period was started for 70 days Dietary Cr Met supplementation caused significant improvements in egg production rate egg mass as well as feed consumption In addition Cr Met decreased P 0 01 feed conversion ratio at the first 35 d and tended to decrease this parameter in the whole trial period Similarly addition of Vit C numerically increased egg production and egg mass in the whole experimental period Egg production feed intake and feed conversion ratio in the whole period was affected by Cr Met by Vit C interaction so that co utilization of two supplements had the better effects only at the levels of 500 ppm Vit C and 500 ppb chromium Cage density had significant effects on egg production rate egg mass and feed consumption so that density of 7 hens cage significantly decreased the mentioned parameters however cage density had no considerable effect on feed efficiency Interestingly dietary Cr Met caused significant P 0 05 improvements in yolk color index shell breaking strength and Hough unit at mid period Only significant effect of Vit C in the light of egg quality parameters was observed for yolk color index at the mid trial period On the other hand the marked negative interacted effects P 0 05 between Cr Met and Vit C was seen for shell thickness and shell breaking strength at the end period Cage density of 7 hens cage improved egg shell thickness Cr Met supplementation of diets decreased yolk triglycerides P 0 05 and serum insulin P 0 0001 and glucose P 0 01 but had no clear effect on yolk cholesterol Serum insulin and glucose of hens that kept at 7 hens cage density were significantly P 0 001 increased Dietary inclusion of Cr Met resulted in numerical increase in serum HDL concentration Also Cr Met increased Newcastle antibody titer at d 14 post vaccine inoculation and tended to improve it at 7th post vaccination In contrast density of 7 hens cage significantly P 0 01 decreased the Newcastle antibody titers Totally it seems that the organic Cr Met supplement can improve laying hen s performance probably with decreasing the stressful conditions and in this regard synergistic effects among Cr Met and Vit C can be considerable Keywords Laying hens Chromium methionine Vitamin C Immune responses Stress condition Cage density

رحمان جهانيان، عبدالحسين سميع

محمد علي ادريس

امير حسين مهدوي، اميرحسين گلي