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In heat-processed feed ingredients, the concentration of bioavailable lysine (Lys) may be estimated by measuring the amount of ileal digestible Lys that has a free ɛ–NH 2 (i.e., not bound to reducing sugars). This Lys, called ileal digestible reactive Lys, is determined by measuring the reactive Lys in the feed ingredient and in ileal digesta of pigs fed the feed ingredient. A procedure used...
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