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Table 5 Suggested minimum standardized ileal digestible amino acid ratios for growing swine 1

From: Practical starter pig amino acid requirements in relation to immunity, gut health and growth performance

  Pig weight range, kg
Amino acid 4 to 25 25 to 40 40 to 60 60 to 80 80 to 100 100 to 130
Lysine 100 100 100 100 100 100
Threonine2 62 61 61 62 63 64
Methionine3 28 28 28 28 28 28
Methionine + cysteine4 58 56 56 56 57 58
Tryptophan 5 18+ 18+ 18+ 18+ 18+ 18+
Isoleucine6 52 52 52 52 52 52
Valine 65 65 65 65 65 65
  1. 1Adapted from Shannon and Allee, [24] with updates from recent research conducted by the authors and summarized in this paper. Ratios are based on NRC [23] nutrient levels for ingredients. Nutritionists should review their ingredient nutrient values relative to NRC [23] to apply these ratios to their diets.
  2. 2Threonine:lysine = 0.0000130x2 - 0.0014229x + 0.6387290.
  3. 3Methionine:lysine = 0.0000020x2 - 0.0000808x + 0.2806061.
  4. 4Methionine & Cysteine: lysine = 0.0000113x2 - 0.0012621x + 0.5785238.
  5. 5Tryptopan:lysine ratio appears to be increased when the diet contains large excesses of large neutral amino acids (leucine, isoleucine, valine, phenylalanine, and tyrosine). Improvements in pig growth have been observed with Trp:Lys ratios greater than 18%.
  6. 6Ratio is at least 60% when high levels of blood meal or cells are included in the diet. Ratio may be lower than 52% when blood cells are not included, but more research is required to verify and to determine the optimal ratio of isoleucine to leucine.