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Table 6 Plasma AA profile of broilers fed arginine deficient diets supplemented with arginine or L-citrulline

From: Effects of arginine replacement with L-citrulline on the arginine/nitric oxide metabolism in chickens: An animal model without urea cycle

AA, ng/µL

Dietary treatments

P value

PC

NC

NCL

 

Essential AA

  Threonine

72.48 ± 4.58b

88.59 ± 6.08a

62.19 ± 4.37b

0.005

  Methionine

9.85 ± 0.46

12.00 ± 0.93

11.14 ± 0.67

0.125

  Lysine

39.33 ± 8.93

24.75 ± 4.57

52.04 ± 10.29

0.090

  Histidine

13.01 ± 1.38

15.28 ± 1.76

10.48 ± 1.13

0.086

  Phenylalanine

25.55 ± 1.09

30.41 ± 0.84

28.93 ± 1.96

0.059

  Arginine

60.89 ± 4.14a

24.49 ± 1.62b

51.00 ± 5.43a

 < .000

  Isoleucine

10.86 ± 0.70

13.36 ± 0.77

12.25 ± 0.94

0.114

  Leucine

26.97 ± 2.53c

39.15 ± 1.42a

32.75 ± 1.54b

0.001

  Valine

20.19 ± 0.97b

27.39 ± 1.27a

20.73 ± 1.60b

0.001

  Cysteine

14.51 ± 1.11b

22.14 ± 1.07a

16.70 ± 1.44b

0.001

  Tryptophan

8.10 ± 0.54

6.52 ± 0.74

7.40 ± 0.76

0.285

  Glycine

52.43 ± 3.26

57.05 ± 3.46

45.96 ± 3.46

0.091

Non-essential AA

  Citrulline

6.22 ± 0.71b

9.72 ± 0.85a

9.87 ± 0.99a

0.010

  Ornithine

3.47 ± 0.18ab

2.68 ± 0.25b

3.76 ± 0.36a

0.030

  Aspartate

15.43 ± 1.57b

34.25 ± 2.99a

21.12 ± 1.99b

 < .000

  Serine

58.91 ± 3.59b

75.76 ± 5.98a

59.82 ± 5.97b

0.062

  Proline

47.61 ± 4.48b

71.42 ± 3.62a

49.10 ± 4.31b

0.001

  Glutamate

36.29 ± 1.39

39.98 ± 2.62

37.10 ± 1.88

0.415

  Alanine

87.94 ± 3.77b

134.47 ± 10.06a

88.39 ± 4.67b

 < .000

  Sarcosine

2.47 ± 0.18ab

2.84 ± 0.04a

2.15 ± 0.14b

0.006

  Cystathionine

5.45 ± 0.42b

7.23 ± 0.42a

6.35 ± 0.42ab

0.024

  Taurine

12.10 ± 0.91

13.44 ± 1.81

18.21 ± 4.77

0.335

  Tyrosine

40.55 ± 2.34

45.80 ± 2.38

42.74 ± 4.61

0.535

  Beta-Alanine

4.64 ± 0.36

4.05 ± 0.21

4.58 ± 0.21

0.255

  Gamma-aminobutyric acid

0.96 ± 0.11

0.60 ± 0.09

0.85 ± 0.11

0.066

  3Methylhistidine

2.15 ± 0.25

1.70 ± 0.20

1.71 ± 0.29

0.371

  Anserine

7.00 ± 0.25

7.53 ± 0.56

8.06 ± 0.61

0.350

  Carnosine

3.48 ± 0.37

3.41 ± 0.32

2.79 ± 0.14

0.211

  1. PC: Positive control, NC: Negative control, NCL: Negative control + L-citrulline
  2. Data are presented as mean ± SEM (n = 8). a,b,c Means with different superscript letters are significantly different (P < 0.05) within the same row