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The optimal dietary standardized ileal digestible (SID) threonine:lysine ratio (Thr:Lys) for gain-to-feed ratio (G:F) in weaned pigs reared under unclean sanitary conditions (Exp. 1) determined using quadratic broken-line analysis was 66.5% [Y = 0.72−0.0021 (66.5−x)2]. Data points (●) represent least square means of dietary treatments (n = 6).
