Loughmiller, J.A.Smith, J.W.IIBergstrom, J.R.Goodband, Robert D.Tokach, Michael D.Nelssen, Jim L.2010-03-022010-03-022010-03-02http://hdl.handle.net/2097/2766Sixty four gilts (initially 120 lb) were used to evaluate the effects of increasing total sulfur amino acid (TSAA):lysine ratios on growth performance and carcass characteristics. Diets included two levels of lysine (.55% and .70% total lysine) and three TSAA:lysine ratios (60, 65, and 70% of lysine) arranged in a 2 x 3 factorial. A tendency for a lysine x TSAA interaction was observed for ADG and ADFI. Increasing TSAA:lysine ratio decreased ADG and ADFI in pigs fed .55% lysine; however, ADG and ADFI were increased in pigs fed .70% lysine and 65% TSAA:lysine. Pigs fed .70% lysine had improved ADG, F/G and 10th rib fat depth compared to those fed .55% lysine. However, no effects were observed with increasing TSAA: lysine ratios. These results suggest that the TSAA requirement of finishing pigs is not greater than 60% of total lysine.SwineFinishing pigsMethionineAmino acidsConference paper