اثر متقابل سطح متيونين و نوع منبع چربي جيره بر عملكرد، كيفيت تخم مرغ و قابليت هضم مواد مغذي در مرغ هاي تخمگذار

چكيده انگليسي :

62 Interactive Effect of Dietary Methionine Level and Fat Source on Performance Egg Quality and Ileal Nutrient Digestibility in Laying Hens Yaser Moradpour Moradpour yaser@gmail com July Department of Animal Sciences College of Agriculture Isfahan University of Technology Isfahan IRAN Degree M Sc Language Farsi Supervisors Dr Rahman Jahanian r jahanian@cc iut ac ir Dr Ali Sadeghi sadeghism@cc iut ac ir Abstract The present trial was performed to examine the interactive effects of dietary fat source and methionine Met level on performance internal and external egg qualities ileal nutrient digestibility and blood biochemical parameters of laying hens A total of Lohman Brown laying hens of wk age were randomly distributed among replicates of dietary treatments according to a factorial arrangement of treatments including different fat sources soybean oil SO acidulated fatty acids FA or fatty acid powder FP and three different Met levels or of diet The trial lasted d including d for adaptation and d two d periods as the main recording period Performance parameters including feed intake hen day egg production egg weight and mass feed conversion ratio FCR and also egg quality indexes were measured periodically At the end of experimental period two birds from each cage were slaughtered to determine the relative weights of liver gallbladder and pancreas Also Ileal contents were collected to measure ileal nutrient digestibility Among performance parameters only FCR was affected P by dietary treatments so that the best FCR values assigned to the hens fed on FA diets followed by those on SO diets Dietary supplementation with SO caused P increase in yolk color index during the first d period On the other hand the least eggshell thickness during the first d was assigned to the birds fed on FA diets leading to decrease in eggshell breaking strength during the second d Increase in dietary Met level resulted P in increases in absolute shell and yolk weights Also albumen percentage was influenced by dietary fat source and dietary inclusion of FP increased P albumen percentage The highest P relative weights of pancreas and gallbladder were seen in the birds fed on FP diets Interestingly increase in dietary Met level to of diet decreased P relative liver weight Dietary fat source affected P malondialdehyde MDA content of egg yolk with the least MDA concentration observed in the birds fed on FP diets In addition dietary utilization of FA and FP increased P yolk and serum cholesterol while did not affect serum triglycerides There were significant P differences between dietary fat sources in the light of serum low and high density lipoproteins Dietary inclusion of soybean oil improved P antibody titer against Newcastle disease virus at d after vaccination whereas higher Met levels improved P it during both d and after vaccine inoculation Serum activities of aspartate AST and alanine ALT aminotransferase were influenced by dietary fat source and dietary inclusion of FA and FP decreased AST whereas SO reduced ALT activity Increase in dietary Met level decreased P serum AST but had no significant effect on serum ALT activity Dietary fat source had considerable effects on digestibilities of fat P and organic matter P but ileal digestibilities of the crude protein dry matter and ash weren t affected by dietary fat source Higher Met levels increased the ileal fat P protein P digestibilities Overall the results suggest that source of dietary fat could affect dietary Met requirements and utilization of FA and FP sources increases the demands of dietary methionine PDF created with pdfFactory trial version www pdffactory com

مرادپور، ياسر

اثر متقابل سطح متيونين و نوع منبع چربي جيره بر عملكرد، كيفيت تخم مرغ و قابليت هضم مواد مغذي در مرغ هاي تخمگذار

مولفه هاي بيوشيميايي خون , قابليت هضم ايلئومي , پاسخ هاي ايمني