Lysine Requirements of Rats of Various Body Weights

Abstract
Lysine requirements of rats of various body weights were estimated using feeding and isotope tests. The regression equation obtained by the feeding test was Y = 1.03 - 0.58 log X, where Y is lysine percentage of the diet and X is the mean of initial and final body weights (g) of rats achieving optimal growth gains during the feeding period. The regression equation obtained by the isotope test was Y = 0.90 - 0.49 log X, where Y and X are lysine percentage in the diet and body weights (g) or rats achieving optimal growth gains at the injection time, respectively.