A 35-day growth trial was conducted to determine the threonine: lysine ratio necessary to optimize growth performance of the segregated early-weaned (SEW) pig. Twelve
experimental diets included two levels of lysine (1.15% and 1.5% digestible lysine) and
six digestible threonine:lysine ratios (50, 55, 60, 65, 70, and 75%) in a 2 x 6 factorial
arrangement. Growth performance was improved by feeding 1.5% digestible lysine, rather than 1. 15% digestible lysine. However,
growth performance was not improved by increasing dietary threonine. These data indicate that the threonine requirement is no
more than 50% of digestible lysine.