Ideal isoleucine and valine to lysine ratios in low protein diets for growing pigs

Isoleucine (ILE) or valine (VAL) are considered to be potentially limiting the dietary protein quality in protein reduced pig diets supplemented with L-lysine∙HCl, DL-methionine, L-threonine and L-tryptophan. Consequently, validated dietary ratios of both amino acids (AA) are necessary to ensure optimal feed protein utilization in fast growing pigs. Therefore, the present study with growing fattening pigs was conducted to derive AA efficiency data of ILE and VAL as related to lysine (LYS) in low protein diets to conclude ideal amino acid ratios (IAAR) of ILE, VAL and LYS, respectively.