Table 2 Analyzed and calculated concentration of nitrogen, total and free amino acids in control (CON), optimal (OPT) and optimal + leucine (OPTLEU) diets¹ (g/kg, as-fed basis)

 Dry matter

887.6

–

889.5

–

891.5

–

 Nitrogen

30.0

30.8

22.0

22.4

22.8

22.9

 Arginine

12.3

12.6

7.5

7.8

8.0

7.8

 Histidine

4.9

5.3

3.9

4.3

4.0

4.3

 Isoleucine

8.5

8.1

6.1

6.0

6.4

6.0

 Leucine

16.5

16.7

11.4

11.9

15.9

16.4

 Lysine

11.1

10.4

10.8

10.1

11.1

10.1

 Methionine

2.7

3.1

2.7

3.3

3.1

3.3

 Methionine + cysteine

5.6

6.3

4.8

5.7

5.2

5.7

 Phenylalanine

9.8

9.6

7.5

7.6

7.7

7.6

 Phenylalanine + tyrosine

16.0

15.9

11.9

12.0

12.3

12.0

 Threonine

7.2

7.3

6.4

6.8

6.6

6.8

 Tryptophan

2.5

2.3

1.8

1.9

1.8

1.9

 Valine

9.4

9.0

8.9

8.9

9.2

8.9

 Arginine

0.3

–

0.1

–

0.1

–

 Histidine

–

–

0.7

0.7

0.7

0.7

 Isoleucine

0.1

–

0.8

0.8

0.8

0.8

 Leucine

0.1

–

0.1

–

4.3

4.5

 Lysine

0.2

–

3.6

3.7

3.7

3.7

 Methionine³

–

–

0.7

1.1

0.7

1.1

 Methionine + cysteine

–

–

0.7

1.1

0.7

1.1

 Phenylalanine

–

–

1.2

1.3

1.2

1.3

 Phenylalanine + tyrosine

0.1

–

1.2

1.3

1.2

1.3

 Threonine

0.2

–

2.0

2.0

2.0

2.0

 Tryptophan⁴

–

–

–

0.5

–

0.5

 Valine

–

–

2.7

2.9

2.7

2.9