caa a22 4500 386322465 CHVBK 20180307111631.0 cr unu---uuuuu 161130e198809 xx s 000 0 eng 10.1079/BJN19880103 doi S0007114588001047 pii (NATIONALLICENCE)cambridge-10.1079/BJN19880103 Further studies on the nutritional factors affecting the urinary excretion of acid-soluble peptides in rats [Elektronische Daten] 1. Nutritional factors affecting the urinary excretion of acid-soluble peptides (ASP) were studied in rats. The ratio, total urinary nitrogen: ASP-form leucine + valine was lowest in the rats fed on a protein-free diet and increased as retained N: absorbed N decreased. The ratio was not affected by dietary protein level when the level was below the National Research Council (1978) recommended requirement, but increased greatly when it exceeded the recommended requirement. 2. The excretion of ASP-form leucine + valine per kg body-weight was significantly lower in the protein- deficient rats than in those fed on protein-adequate diets. This variable decreased during the stage of rapid growth, but did not change as markedly after the onset of adolescence. It increased again when the rats became older. The patterns of change in the rate of excretion of ASP-form amino acids during growth and that of Nr-methylhistidine were different. 3. When labelled amino acids were injected into rats, the largest amount of the ASP-form label was excreted on the 1st day of injection. From the 2nd day the excretion of ASP-form label decreased exponentially. 4. The findings suggest that the rate of urinary excretion of ASP-form amino acids can be employed as an index of protein metabolism, particularly as a simple index of the assessment of the status of protein nutrition. Copyright © The Nutrition Society 1988 Noguchi Tadashi Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan Nam Taek Jeong Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan Kato Hisanori Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan Naito Hiroshi Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan British Journal of Nutrition Cambridge University Press 60/2(1988-09), 321-337 0007-1145 60:2<321 1988 60 BJN https://doi.org/10.1079/BJN19880103 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1079/BJN19880103 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Noguchi Tadashi Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan NATIONALLICENCE 700 1- Nam Taek Jeong Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan NATIONALLICENCE 700 1- Kato Hisanori Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan NATIONALLICENCE 700 1- Naito Hiroshi Department of Agricultural Cliemistry, Faculty of Agriculture, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan NATIONALLICENCE 773 0- British Journal of Nutrition Cambridge University Press 60/2(1988-09), 321-337 0007-1145 60:2<321 1988 60 BJN CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge