Figure 3.

Regression analysis showing the efficiency of Lys intake on N retention in pigs fed a high (HR; 0.36) or a low (LR; 0.33) E:T ratio diet. The LR diet is represented in the figure with short dashes (LR; 0.33 -------), while the HR is presented in the figure with a solid line (HR; 0.36——). Data of the regression analysis using the one slope model: Y = a + b(x), where Y is the N retention (g/d), a represents the intercept (extrapolating the maintenance requirement), b is the slope representing the efficiency of SID Lys utilization for N retention and × representing the SID Lys intake (g/d). The equations are as follows: LR diet (Y = 6.05 + 10.8 x; R² = 0.80) while the HR diet (Y = 8.80 + 7.73 x; R² = 0.53). The intercept P = 0.08 and slope P = 0.04.