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Comparison of methods for estimating basal endogenous losses of amino acids and additivity of digestibility of amino acids in corn and soybean meal for broilers

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Animal Nutrition 2023年第4期15卷 233-241页

作者： June Hyeok Yoon Changsu Kong Department of Animal Science and Biotechnology Kyungpook National UniversitySangju 37224Republic of Korea Department of Animal Science Kyungpook National UniversitySangju 37224Republic of Korea Research Institute of Horse Industry Kyungpook National UniversitySangju 37224Republic of Korea

This study was to compare the estimates of basal endogenous losses(BEL)of amino acids(AA)determined by 3 methods including feeding a nitrogen-free diet(NFD)or a low-casein diet(LCD,containing casein at 30 g/kg diet)or using the regression *** objective was to investigate whether the ileal AA digestibility of corn calculated from a casein-supplemented corn diet is additive for a cornsoybean meal(SBM)mixed diet in *** d 31 of age,168 Ross 308 male broilers were assigned to 8 dietary treatments with 6 replicates in a randomized complete block *** NFD and 3 diets containing 30,60,or 90 g/kg of casein were formulated to determine the BEL of AA and ileal AA digestibility of *** other 4 diets consisted of a corn diet,SBM diet,casein-supplemented corn diet,and corn-SBM mixed *** d 35 of age,digesta from the distal section of the ileum were *** BEL of AA in birds fed the LCD were greater(P<0.05)than those of the NFD and the regression *** were no differences in the BEL of AA determined between the NFD and the regression *** ileal digestibility(AID)and standardized ileal digestibility(SID)of AA for corn calculated from the casein-supplemented corn diet were greater(P<0.05)than those of the corn *** predicted AID of Thr in the corn-SBM mixed diet based on the AID of AA for corn in the corn diet was lower(P<0.05)than the measured ***,the predicted AID of AA in the mixed diet based on the AID of AA for corn in the casein-supplemented corn diet did not differ from the measured *** predicted SID of AA in the mixed diet did not differ from the measured SID irrespective of casein *** conclusion,feeding an NFD or using the regression method yields similar BEL of AA,but not feeding an *** supplementation in the corn diet increases the ileal AA digestibility for corn,which is additive for the corn-SBM mixed diet.

关键词： Amino acid Casein Broiler Additivity basal endogenous loss

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