اثر متقابل سطح آرژنين و متيونين جيره بر عملكرد ، پاسخ هاي ايمونولوژيك و فراسنجه هاي خوني جوجه هاي گوشتي

چكيده انگليسي :

ABSTRACTThe study presented here aimed to investigate possible dietary arginine Arg by methionine Met interactionin broiler chicks A total of 540 day old Ross 308 broiler chicks were randomly assigned into the 9experimental diets with 5 replicates of 12 birds each Dietary treatments consisted of a 3 3 factorialarrangement with three dietary Arg levels 90 100 or 110 of NRC specifications for Arg and three Metlevels 90 100 or 110 of NRC recommendations for dietary Met content which fed during a 42 d feedingtrial Average daily feed intake ADFI and gain ADG as well as feed conversion ratio FCR wererecorded periodically as starter 1 21 d of age and grower 21 42 d of age periods At the final trial day twobirds per each pen were slaughtered to evaluate carcass measurements Also antibody production titersagainst viral antigens and sheep red blood cell SRBC were measured after respective antigen inoculations Furthermore blood biochemical parameters were measured at d 21 and 42 of age Results showed that bodyweight gain was increased P 0 01 during starter grower and entire trial periods by both dietarysupplementation of Arg and Met up to 100 of NRC recommendations Feed conversion values during alltrial periods were decreased P 0 01 as the result of incremental Met levels but the highest difference wasobtained by Met supplementation up to 100 of NRC recommendations Furthermore Arg fortification ofdeficient diets improved P 0 05 FCR values during all experimental stages The significant Arg by Metinteractions were observed for FCR values during weeks 1 and 4 so that Met fortification of diets was moreeffective when diets already supplemented with Arg level of 110 of NRC recommended values Incremental Arg levels up to 110 of NRC values increased P 0 01 relative weight of bursa of Fabriciusand Met supplementation 110 had conversed effect on bursa weight in diets contain in 90 and even 100 Arg Dietary Met supplementation up to 100 of NRC Specifications increased P 0 05 antibody titeragainst SRBC injection Also incremental levels of methionine P 0 0712 up to 100 and arginine P 0 0991 up to 110 of NRC tended to increase antibody responses against Newcastle disease virus NDV In addition Arg fortification of dietenhanced P 0 01 antibody titer against bronchitis virus IBV whereas Met supplementation tended P 0 0760 to increase anti bronchitis titers On the other hand bothMet and Arg up to 100 of NRC values increased P 0 01 antibody response against infection bursaldisease IBD virus The significant Arg Met interactions were observed for antibody titers against SRBC IBV and IBD so that Arg fortification of diets up to 110 of NRC was more effective when diets alreadysupplemented with Met level of 100 of NRC Incremental levels of Met and Arg up to 110 and 100 ofNRC respectively enhanced serum gammaglobulins At d 21 Met level up to 110 of NRCrecommendations tended P 0 09 to decrease serum high density lipoproteins HDL and Arg Metinteraction affected P 0 05 HDL values Arginine level up to 110 of NRC specifications increased low density lipoproteins Dietary Arginine supplementation increased P 0 05 serum HDL concentration at d 42of age One could achieve maximum performance and feed efficiency with supplementation of diets with Argand Met up to 110 and 100 of NRC recommendations respectively The present findings confirm dietaryArg Met interaction to promote immunological responses of broiler chicksKeywords Broiler Chicks Arginine Methionine Blood Biochemistry Growth Performance AntibodyTiter Cellular and Humoral Immune Response Carcass Characteristics

خليفه قلي، مريم

اثر متقابل سطح آرژنين و متيونين جيره بر عملكرد ، پاسخ هاي ايمونولوژيك و فراسنجه هاي خوني جوجه هاي گوشتي

مولفه هاي خوني , پاسخ هاي ايمني و جوجه هاي گوشتي