Skip to main content

Table 7 Longissimus dorsi amino acid concentrations 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

Thr

FS

Thr × FS

Number of observations

5

3

6

5

5

5

5

5

5

5

    

Chemical composition * , %

 Dry matter

24.38

24.49

24.15

24.05

24.51

23.95

23.99

24.55

24.53

24.30

0.43

0.96

0.82

0.47

 Crude protein

20.63

21.07

21.13

20.92

21.59

21.31

21.32

21.07

21.29

20.71

0.41

0.92

0.66

0.03a

 Fat

2.15

2.05

1.97

1.44

1.73

1.70

1.78

1.71

1.79

1.95

0.27

0.66

0.56

0.30

 Ash

1.14

1.19

1.18

1.19

1.18

1.15

1.18

1.17

1.18

1.17

0.04

0.73

0.68

1.00

 Collagen

0.57

0.62

0.60

0.51

0.45

0.55

0.54

0.54

0.52

0.54

0.04

0.05

0.64

0.09c

Essential amino acids, g/100 g of crude protein

 Arginine

7.38

7.51

7.34

7.33

7.19

7.40

7.41

7.34

7.40

7.49

0.12

0.75

0.36

0.36

 Histidine

5.29

4.91

4.81

4.92

4.64

5.23

4.98

4.92

4.84

4.96

0.16

0.01

0.38

0.50

 Isoleucine

5.10

5.22

5.07

5.07

4.98

5.13

5.10

5.08

5.06

5.20

0.07

0.57

0.51

0.08a,d

 Leucine

8.62

8.68

8.63

8.57

8.36

8.68

8.60

8.56

8.55

8.74

0.09

0.60

0.27

0.02a,d

 Lysine

9.39

9.52

9.42

9.39

9.11

9.49

9.43

9.33

9.30

9.47

0.12

0.36

0.53

0.08c

 Methionine

2.66

2.38

2.70

2.87

2.52

2.97

2.45

2.28

2.41

2.51

0.23

0.25

0.40

0.18

 Phenylalanine

4.48

4.48

4.47

4.48

4.34

4.51

4.45

4.43

4.48

4.48

0.06

0.53

0.54

0.33

 Threonine

4.89

4.91

4.92

4.92

4.70

4.92

4.92

4.85

4.86

4.94

0.07

0.42

0.30

0.03c

 Valine

5.37

5.44

5.34

5.32

5.24

5.41

5.34

5.34

5.32

5.47

0.08

0.74

0.39

0.13

Non-essential amino acids, g/100 g of crude protein

 Alanine

6.03

6.10

6.04

6.05

5.81

6.12

6.04

6.03

6.00

6.08

0.07

0.14

0.18

0.02c

 Asparagine

11.88

11.76

11.66

11.85

11.34

11.81

11.74

11.80

11.78

11.85

0.16

0.35

0.24

0.14

 Cysteine

0.94

0.97

0.95

0.88

0.90

0.90

0.92

0.93

0.94

0.97

0.03

0.50

0.69

0.05a,b

 Glutamate

17.42

17.72

17.73

17.81

16.28

16.98

17.78

17.52

17.45

18.01

0.56

0.55

0.58

0.09c

 Glycine

4.75

4.76

4.70

4.76

4.57

4.79

4.73

4.80

4.75

4.81

0.07

0.68

0.08

0.18

 Proline

4.00

4.02

4.02

4.03

3.90

4.06

4.03

4.05

4.00

4.08

0.06

0.86

0.10

0.20

 Serine

4.19

4.13

4.22

4.21

4.04

4.23

4.18

4.16

4.15

4.17

0.05

0.13

0.48

0.16

 Tyrosine

4.16

4.19

4.16

4.18

4.04

4.20

4.16

4.14

4.16

4.19

0.06

0.65

0.47

0.32

  1. 1MSE, maximum standard error; *Fresh basis
  2. 2Thr, level of threonine; FS, feeding system; Thr × FS, interaction between level of threonine and feeding system; linear effect for Thr; alinear effect within IPF; blinear effect within GPF; cquadratic effect within IPF; dquadratic effect within GPF;