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Table 3 Previously proposed amino acid compositions for ideal proteins for 10–20 kg growing pigs 1 (% of lysine)

From: Dietary requirements of synthesizable amino acids by animals: a paradigm shift in protein nutrition

Amino acid

Amino acid content in the carcass2

ARC (1981) Ref.[39]3

Wang-Fuller (1989) Ref.[44]4,a

Chung-Baker (1992) Ref.[45]4,b

NRC (1998) Ref.[40]5,b

Baker (2000) Ref.[46]4,b

Arginine

91

---

---

42

42

42

Glycine

---

---

---

100

---

---

Histidine

47

33

---

32

32

32

Isoleucine

53

55

60

60

54

60

Leucine

111

100

110

100

102

100

Lysine

100

100

100

100

100

100

Met + Cys

49

50

63

60c

57e

60c

Phe + Tyr

100

96

120

95d

94f

95d

Proline

---

---

---

33

---

---

Tryptophan

12

15

18

18

19

17

Threonine

61

60

72

65

62

65

Valine

72

70

75

68

68

68

Glutamate6

---

---

826

878

---

---

  1. 1These ratios are based on true digestible levels of amino acids in diets [40, 4446], except for ARC (1981) [36]. Except for glycine, all amino acids are L-isomers.
  2. 2Taken from Baker (1997) [38]. The body proteins in 20–45 kg pigs contain 63 g lysine/16 g nitrogen [38].
  3. 3These ratios are based on total amino acids in the diet. The total level of lysine in the diet is 1.10% (as-fed basis; 90% dry matter).
  4. 4The diet contains 1.20% true digestible lysine (as-fed basis; 90% dry matter).
  5. 5The diet contains 1.01% true digestible lysine (as-fed basis; 90% dry matter).
  6. 6Provided as the nitrogenous source for synthesis of other NEAA in animals.
  7. aDietary requirements are for 25–50 kg gilts.
  8. bDietary requirements are for 10–20 kg pigs.
  9. cThe ratio of L-methionine to L-cystine is 1:1.
  10. dThe ratio of L-phenylalanine to L-tyrosine is 53:47.
  11. eThe ratio of L-methionine to L-cystine is 47:53.
  12. fThe ratio of L-phenylalanine to L-tyrosine is 64:36.