期刊名称：Journal of Nutritional Science and Vitaminology
印刷版ISSN：0301-4800
电子版ISSN：1881-7742
出版年度：1986
卷号：32
期号：4
页码：381-387
DOI：10.3177/jnsv.32.381
出版社：Center for Academic Publications Japan
摘要：Age-related changes in nitrogen balance and related vari-ables in later life of male Wistar rats fed 14.0g/day (group C) or 8.7g/day (group R) of 20% casein diet throughout life were examined at intervals of 50 days from day 650 of age. In both groups, body weight decreased from about day 600, and the body weight at the final examinations (on day 1, 000 in group C and 1, 100 in group R) were 18% and 13%, respectively, less than those on day 600, although the animals consumed more than 98% of their food throughout. Their nitrogen balance fluctuated through-out later life in both groups, but the overall changes did not show a consistent negative or positive pattern. Consequently, the mean nitrogen balance after 650 days of age was calculated as -11.5±45.3mg N/day in group C and-1.3±11.6mg N/day in group R. On the other hand, protein digestibility increased steadily after 650 days of age in both groups. As a whole, nitrogen metabolism at the whole body level did not change consistently even in later life.
关键词：feed restriction;N-balance in aging rats;protein digestibility in aging rats;urinary creatinine in aging rats;body weight decrease in aging rats
