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Two experiments were conducted to evaluate the relative bioavailability (RBA) and physiological impact of L-methionine (LM,99%) compared with DL-methionine (DLM,99%).In Exp.1,168 crossbred pigs (7.15 ± 0.97 kg BW) at 26 d of age (5 d post-weaning) were randomly allotted to 7 dietary treatments.