Bergstrom, J.R.Loughmiller, J.A.Musser, R.E.Nessmith, W.B.,Jr.Nelssen, Jim L.Tokach, Michael D.Goodband, Robert D.Dritz, Steven S.2010-03-022010-03-022010-03-02http://hdl.handle.net/2097/2800A 21-day growth trial was conducted to determine the isoleucine: lysine ratio necessary to optimize growth performance of the 25 to 50 lb nursery pig reared in a segregated early-weaning (SEW) system. Ten experimental diets, including two levels of lysine (.75% and 1.10% digestible lysine) and five apparent digestible isoleucine:lysine ratios (45, 50, 55, 60, and 65%), were used in a 2 x 5 factorial arrangement. Growth performance was improved by feeding 1.10% rather than .75% digestible lysine. Also, results indicated that the apparent digestible isoleucine requirement for the SEW-reared, 25 to 50 lb pig is approximately .50% of digestible lysine.SwineEarly-weaned pigsAmino acidsIsoleucineConference paper