The low and high fibre diets were formulated to contain less than 4% and 9% CF, respectively (Tables 1 and 2). For all diets, dietary ileal digestible methionine and cysteine, threonine, tryptophan, isoleucine, valine, and leucine contents expressed as per cent of ileal digestible lysine were 63%, 72%, 21%, >60%, >67% and >100%, respectively (Table 2).