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Table 4 Concentrations of amino acids (AAs) in the plasma of dogs, cats, and pigs

From: Amino acid nutrition and metabolism in domestic cats and dogs

AAs

Dogsa

Cats

Pigs

<  2 wk

of age

(n = 7)

2 wk to 2

mo of age

(n = 7)

12 to 60

mo of age

(n = 7)

>  60 mo

of age

(n = 8)

Young

kittensc

(n = 8)

Adultsd

(n = 120)

4 d

of agee

(n = 10)

2.5 mo

of agef

(n = 8)

18 mo

of ageg

(n = 8)

Ala

315 ± 46

296 ± 180

400 ± 129

332 ± 162

603 ± 62

462 ± 160

1049 ± 478

596 ± 91

352 ± 58

Arg

278 ± 80

245 ± 101

103 ± 29

104 ± 36

95 ± 38

163 ± 63

159 ± 45

165 ± 19

Asn

121 ± 43

121 ± 48

52 ± 16

47 ± 10

91 ± 25

118 ± 28

62 ± 8

66 ± 10

Asp

19 ± 9

11 ± 3

trace

trace

28 ± 12

25 ± 9

13 ± 6

12 ± 5

Cit

88 ± 39

107 ± 45

34 ± 10

38 ± 12

18 ± 6

89 ± 25

64 ± 6

60 ± 8

Cysh

42 ± 38

56 ± 36

32 ± 22

42 ± 26

26 ± 9

165 ± 33g

173 ± 12

170 ± 23

Gln

564 ± 174

461 ± 139

593 ± 175

658 ± 213

664 ± 134

469 ± 120

513 ± 79

491 ± 59

Glu

112 ± 82

73 ± 32

35 ± 8

38 ± 12

73 ± 38

156 ± 63

172 ± 40

92 ± 15

Gly

283 ± 85

364 ± 107

181 ± 61

171 ± 42

398 ± 279

824 ± 237

664 ± 62

688 ± 81

His

140 ± 45

85 ± 28

66 ± 13

65 ± 15

116 ± 24

114 ± 47

103 ± 20

97 ± 16

Ile

83 ± 24

70 ± 23

67 ± 21

63 ± 18

51 ± 8

63 ± 29

159 ± 57

112 ± 28

104 ± 15

Leu

212 ± 39

147 ± 69

142 ± 34

135 ± 48

91 ± 14

146 ± 49

186 ± 51

246 ± 42

196 ± 18

Lys

275 ± 68

195 ± 121

149 ± 46

191 ± 55

108 ± 61

223 ± 82

88 ± 48

103 ± 35

Met

52 ± 33

73 ± 20

46 ± 15

52 ± 16

116 ± 51

64 ± 28

100 ± 51

35 ± 6

47 ± 6

Orn

85 ± 31

43 ± 16

19 ± 9

17 ± 7

21 ± 12

107 ± 38

85 ± 17

82 ± 20

Phe

60 ± 13

64 ± 25

61 ± 14

63 ± 18

72 ± 11

70 ± 15

117 ± 35

87 ± 11

89 ± 14

Pro

389 ± 106

290 ± 105

145 ± 61

114 ± 15

258 ± 76

628 ± 373

395 ± 59

382 ± 50

Ser

241 ± 40

262 ± 91

123 ± 28

138 ± 31

179 ± 85

267 ± 123

153 ± 45

157 ± 38

Taurine

77 ± 24b

118 ± 55

169 ± 57

56 ± 17

60 ± 21

Thr

523 ± 245

250 ± 151

196 ± 63

157 ± 50

168 ± 51

173 ± 54

369 ± 145

89 ± 45

93 ± 32

Trp

66 ± 27

55 ± 15

69 ± 27

54 ± 17

60 ± 17

38 ± 19

47 ± 8

45 ± 9

Tyr

88 ± 31

54 ± 24

48 ± 7

43 ± 8

36 ± 8

57 ± 15

242 ± 73

105 ± 17

112 ± 24

Val

248 ± 42

200 ± 83

199 ± 43

199 ± 63

131 ± 34

164 ± 62

350 ± 114

280 ± 37

216 ± 31

  1. Cit Citrulline, mo months, Orn Ornithine, Tau Taurine, wk weeks, “–” data were not available
  2. Values are means ± SD
  3. a Blazer-Yost and Jezyk [47] for all amino acids except taurine
  4. b Delaney et al. [48]. Adult cats (n = 131) had a median age of 5.3 years (ranging from 2 to 14 years)
  5. c Hargrove et al. [49]. Kittens (1 to 2 kg body weight) were fed a casein-, soy protein-, and AA mix-based diet
  6. d Heinze et al. [50]
  7. e Flynn and Wu [51]
  8. f Wu et al. [52]
  9. g Wu G (unpublished work). Adult gilts were fed, twice daily at 1% of body weight per meal, a corn- and soybean meal-based diet containing 12.2% CP [53]. Blood samples were obtained from the jugular vein at 2 h after feeding to prepare plasma for AA analysis [52]
  10. h cysteine + ½ cystine