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Effect of dietary standardized ileal digestible (SID) Lys to CP ratio on serum urea levels in piglets at 7 wk of age. Piglets receiving 10 or 11 g SID Lys/kg diet are presented, together with their corresponding and overall broken line models with linear (BLL; A) or quadratic (BLQ; B) ascending portions, or quadratic model (QP; C). Vertical gray lines represent break points for BLL and BLQ, or optima for QP.
