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Table 4 Compositions of amino acids in the whole-body proteins of chicks and pigs

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

Amino acid

Chicks1

Pigs2

Corn grain3

Soybean meal4

Sorghum grain5

Meat & bone meal6

 

mg AA/g protein

% of lysine

mg AA/g protein

% of lysine

g AA/100 g foodstuff

Alanine

66.3

108

65.7

109

0.71

1.95

0.96

4.78

Arginine

68.5

111

67.7

112

0.38

3.18

0.41

3.67

Asparagine

36.5

59.3

36.0

59.7

0.35

2.10

0.31

2.21

Aspartate

43.1

70.1

42.8

71.0

0.43

3.14

0.36

3.08

Cysteine

15.0

24.4

13.2

21.9

0.20

0.70

0.19

0.49

Glutamine

50.5

82.1

51.2

84.9

1.02

3.80

0.85

2.81

Glutamate

82.9

135

84.6

140

0.64

4.17

1.18

4.05

Glycine

115

187

117

19.4

0.40

2.30

0.39

8.67

Histidine

21.1

34.3

20.8

34.5

0.23

1.13

0.23

1.19

Isoleucine

35.9

58.4

35.3

58.5

0.34

2.03

0.38

1.92

Leucine

69.2

113

68.3

113

1.13

3.44

1.21

3.56

Lysine

61.5

100

60.3

100

0.25

2.80

0.21

3.13

Methionine

18.9

30.7

18.7

31.0

0.21

0.60

0.20

1.10

Phenylalanine

34.8

56.6

34.3

56.9

0.46

2.21

0.51

1.85

Proline

85.3

139

86.1

143

1.06

2.40

0.96

5.86

OH-Proline

34.8

56.6

37.9

62.9

0.00

0.09

0.00

2.88

Serine

45.0

73.2

44.3

73.5

0.45

2.12

0.46

2.08

Threonine

36.3

59.0

35.1

58.2

0.31

1.76

0.32

2.42

Tryptophan

11.6

18.9

11.1

18.4

0.07

0.62

0.10

0.39

Tyrosine

26.6

43.3

27.2

45.1

0.43

1.66

0.45

1.45

Valine

41.8

68.0

42.2

70.0

0.44

2.09

0.50

2.23

  1. Except for glycine, all amino acids are L-isomers. Adapted from Wu et al. [21]. Calculations were based on the molecular weights of intact amino acids. OH-Pro = hydroxyproline.
  2. 1Chickens (10-d-old). The content of protein in the body is 14.3 g/100 g wet tissue.
  3. 2Pigs (30-d-old). The content of protein in the body is 14.1 g/100 g wet tissue.
  4. 3As-fed basis (89.0% dry matter). Corn grain contains 9.3% crude protein (as-fed basis) [91].
  5. 4As-fed basis (89.0% dry matter). Soybean meal contains 43.6% crude protein (as-fed basis) [91].
  6. 5As-fed basis (89.1% dry matter). Sorghum grain contains 10.1% crude protein (as-fed basis) [91].
  7. 6As-fed basis (96.1% dry matter). Meat & Bone meal contains 52.0% crude protein (as-fed basis) [91].