1. AFNOR, 1998a. Determination of amino acids. Association Française de Normalisation XPV 18–113, January 1998.
2. AFNOR, 1998b. Determination of tryptophan. Association Française de Normalisation XPV 18–114, January 1998.
3. Digestible lysine requirement of gilts with high genetic potential for lean gain, in relation to the level of energy intake;Bikker;J. Anim. Sci.,1994
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