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Table 9 Blood plasma biochemical parameters of growing barrows (25 to 42 kg body weight) fed different levels of threonine (70%, 85%, 100%, 115%, and 130% of the ideal threonine:lysine ratio of 0.65) in an individual precision-feeding (IPF) system or a group phase-feeding (GPF) system

From: Pigs receiving daily tailored diets using precision-feeding techniques have different threonine requirements than pigs fed in conventional phase-feeding systems

Parameter

IPF

GPF

 

P-value2

70

85

100

115

130

70

85

100

115

130

MSE1

L

FS

L × FS

Number of observations

10

8

11

10

10

11

10

11

11

11

    

Urea, μmol/L

2.70

1.98

2.38

2.19

2.77

2.74

2.04

2.34

2.07

2.40

0.23

< 0.01

0.51

0.83

Albumin, g/L

27.80

26.56

32.12

31.59

33.51

29.50

31.44

32.25

31.63

31.19

1.25

< 0.01

0.19

0.03

Creatinine, μmol/L

116.85

114.69

112.68

110.85

117.50

117.50

116.91

115.35

112.41

119.41

3.69

0.25

0.39

1.00

Lactic acid dehydrogenase, U/L

585.34

581.88

535.13

532.60

570.35

524.96

485.73

537.90

468.60

557.14

47.66

0.53

0.06

0.72

Total protein, g/L

62.65

64.26

65.33

66.90

67.48

61.86

65.56

64.37

66.00

66.13

1.52

0.01

0.52

0.89

Aspartate aminotransferase, U/L

36.75

44.96

38.35

43.80

43.09

36.89

37.50

36.60

36.48

44.21

3.50

0.08

0.08

0.34

Alanine aminotransferase, U/L

47.50

40.79

39.73

40.00

38.39

41.14

45.05

44.37

36.06

43.90

3.03

0.14

0.60

0.04a,b

Creatine kinase, U/L

1083

1561

1227

1822

1918

1108

1244

1562

1015

2172

412

0.15

0.67

0.52

Immunoglobulin G, μg/mL

11.29

11.28

9.93

11.90

10.98

9.71

10.90

9.48

11.31

11.36

1.18

0.19

0.33

0.84

C-reactive protein, μg/mL

9.25

13.02

9.98

18.35

24.78

13.88

15.81

18.46

22.82

12.68

3.56

0.05

0.26

0.01a,c

  1. 1MSE, maximum standard error
  2. 2L, level of threonine; FS, feeding system; L × FS, interaction between level of threonine and feeding system; linear effect for L; quadratic effect for L; alinear effect within IPF; bcubic effect within GPF; cquadratic effect within GPF