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The linear broken-line model estimated nitrogen retention (N retention; g/d) in pigs fed high (HR; 0.36) or low (LR; 0.33) E:T ratio diet. A breakpoint was achieved at 1.08 SID Lys, % with a maximum N retention of 17.8 g/d for pigs fed the HR diets (A). While the breakpoint was achieved in pigs fed the LR diet at 1.21 SID Lys, % with a maximum N retention of 19.3 g/d (B).
