Table 7 Serum AAs and NH₃ [mg/dL] in piglets on weaning depending on farrowing system and weight class (mean ± SD)

Light

n

8

8

10

BW [kg]

6.26^Bab ± 1.14

7.74^Ba ± 1.71

5.31^Bb ± 1.62

Arginine

3.45 ± 0.81

3.41 ± 0.74

2.75 ± 0.96

Leucine

2.70^a ± 0.58

2.07^b ± 0.37

2.75^a ± 0.53

Lysine

3.30^ab ± 0.89

2.72^b ± 0.67

3.48^a ± 0.78

Methionine

1.24 ± 0.41

1.05 ± 0.37

1.28 ± 0.72

Proline

8.27^Aa ± 1.14

6.29^b ± 1.38

7.29^ab ± 2.36

Threonine

3.99^a ± 1.51

2.92^ab ± 1.44

2.63^b ± 1.01

Tryptophan^*

0.78 ± 0.34

0.93 ± 0.34

0.95 ± 0.26

Valine

3.14^a ± 0.45

2.19^Bb ± 0.29

3.50^a ± 0.89

NH₃

8.40 ± 1.35

7.15 ± 1.04

8.00 ± 1.79

Heavy

n

16

14

11

BW [kg]

9.18^A ± 1.97

9.81^A ± 1.88

8.97^A ± 1.75

Arginine

3.80^a ± 0.65

3.40^ab ± 0.75

3.11^b ± 0.54

Leucine

2.75^a ± 0.66

2.35^b ± 0.48

3.03^a ± 0.52

Lysine

3.49^ab ± 1.06

2.92^b ± 0.71

4.13^a ± 1.19

Methionine

1.11 ± 0.25

1.12 ± 0.22

1.15 ± 0.40

Proline

6.87^Ba ± 1.54

6.39^a ± 1.19

8.14^b ± 1.30

Threonine

3.39^a ± 1.31

3.08^ab ± 0.86

2.36^b ± 0.89

Tryptophan^**

1.03 ± 0.54

0.84 ± 0.25

0.89 ± 0.33

Valine

3.19^a ± 0.62

2.68^Ab ± 0.50

3.39^a ± 0.68

NH₃

7.24 ± 0.99

7.25 ± 0.80

6.47 ± 1.74