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Table 8 Carcass muscle amino acid concentrations (without longissimus dorsi) 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

31.10

30.39

29.84

29.59

29.94

29.37

30.22

30.52

29.84

29.73

0.76

0.82

0.55

0.33

 Crude protein

17.40

17.54

17.82

17.78

18.39

18.24

17.93

18.06

17.87

18.18

0.26

0.09†

0.05

0.13

 Fat

12.84

12.19

11.46

10.79

11.25

10.88

11.67

10.72

11.05

11.10

1.02

0.64

0.23

0.70

 Ash

0.99

1.00

1.02

1.01

1.00

1.01

0.99

1.00

1.00

0.99

0.02

0.91

0.48

0.86

 Collagen

1.61

1.60

1.60

1.66

1.63

1.56

1.66

1.73

1.61

1.61

0.08

0.76

0.69

0.41

Essential amino acids, g/100 g of crude protein

 Arginine

7.40

6.63

7.12

7.62

6.99

7.13

7.93

7.63

7.11

7.11

0.29

0.63

0.12

0.01a,b

 Histidine

4.45

3.68

3.94

4.30

4.09

4.27

4.54

4.28

3.88

3.99

0.23

0.48

0.39

0.02a,c

 Isoleucine

4.80

4.39

4.74

4.88

4.48

4.72

5.19

4.99

4.68

4.70

0.19

0.48

0.05

0.03a,b

 Leucine

8.26

7.57

8.10

8.46

7.79

8.12

9.03

8.22

8.10

8.10

0.26

0.61

0.07

0.01a,b

 Lysine

8.74

8.02

8.58

9.05

8.29

8.64

9.51

9.18

8.59

8.63

0.38

0.67

0.06

0.04a,c

 Methionine

2.56

2.19

2.28

2.87

2.73

2.24

2.87

2.36

2.66

2.60

0.26

0.15

0.87

0.19

 Phenylalanine

4.37

3.95

4.23

4.44

4.10

4.29

4.73

4.53

4.23

4.25

0.18

0.66

0.04

0.02a,b

 Threonine

4.56

4.20

4.54

4.76

4.38

4.57

5.09

4.56

4.53

4.51

0.17

0.61

0.07

0.01a,b

 Valine

5.21

4.73

5.09

5.30

4.84

5.12

5.62

5.39

5.09

5.06

0.17

0.44

0.04

0.03a,b

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

 Alanine

6.32

5.74

6.12

6.44

5.91

6.22

6.78

6.61

6.19

6.06

0.26

0.43

0.05

0.04a,d

 Asparagine

11.27

10.15

10.92

11.30

10.46

10.98

12.08

11.58

10.85

10.81

0.47

0.54

0.07

0.03a,c

 Cysteine

0.95

0.88

0.93

0.95

0.87

0.96

1.04

1.03

0.91

0.92

0.05

0.33

0.04

0.20

 Glutamate

15.37

13.44

15.39

13.52

13.37

14.96

15.28

15.23

14.10

13.60

1.20

0.21

0.49

0.82

 Glycine

5.97

5.48

5.80

6.14

5.75

5.97

6.32

6.47

5.98

5.74

0.27

0.44

0.06

0.11

 Proline

4.67

4.29

4.56

4.82

4.50

4.66

5.08

5.01

4.65

4.56

0.20

0.55

0.03

0.04a,d

 Serine

4.11

3.74

4.02

4.21

3.92

4.03

4.50

4.31

4.05

3.97

0.18

0.61

0.07

0.03a,b

 Tyrosine

4.00

3.63

3.92

4.04

3.74

3.91

4.35

4.12

3.85

3.89

0.16

0.55

0.06

0.02a,b

  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; acubic effect within IPF; bcubic effect within GPF; ctendency for a cubic effect within GPF; dquadratic effect within GPF
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Journal of Animal Science and Biotechnology

ISSN: 2049-1891