Fig. 1.

Changes in body weight of rats fed ad libitum commercial chow or purified diets providing varying concentrations of threonine (Thr). A: the rats (6 wk old) were weighed on a daily basis throughout the period tested (n = 4 per group; repeated in 3 separate experiments). Chow (black circles and line), 0.88% Thr (black circles, dotted line), 0.36% Thr (gray circles and line), 0.18% Thr (gray circles, black line), and 0.00% Thr (white circles, black line) are shown. B: daily gain (in grams) of rats fed diets varying in Thr concentration. The daily weight gains were taken as the slopes of the linear part of the plots indicated in the main panel. d, Day.