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Table 3 15N recoveries from stable nitrogen isotope analysis

From: Methionine to cystine ratio in the total sulfur amino acid requirements and sulfur amino acid metabolism using labelled amino acid approach for broilers

δ15N

15N intake (mg)

Body

Breast

Liver

Feather

Excreta

Total

Rec (%)

15N retention (15NR, mg)

L-(15N)-Met

 44:56

10.73 ± 0.06

6.21 ± 0.35

1.55 ± 0.05

0.37 ± 0.02

0.49 ± 0.02

2.12 ± 0.11

10.74 ± 0.48

100 ± 4

 50:50

10.27 ± 0.28

5.83 ± 0.12

1.80 ± 0.13

0.36 ± 0.01

0.40 ± 0.05

1.85 ± 0.07

10.23 ± 0.20

100 ± 1

 56:44

10.25 ± 0.49

5.53 ± 0.42

1.67 ± 0.10

0.29 ± 0.03

0.47 ± 0.04

1.85 ± 0.15

9.80 ± 0.49

96 ± 9

L-(15N2)-Cys

 44:56

12.06 ± 0.10

4.42 ± 0.26

1.04 ± 0.11

0.28 ± 0.04

2.18 ± 0.93

2.47 ± 0.23

10.39 ± 0.72

86 ± 6

 50:50

11.58 ± 0.43

4.21 ± 0.70

1.07 ± 0.11

0.31 ± 0.05

2.71 ± 0.22

2.31 ± 0.14

10.60 ± 0.69

91 ± 4

 56:44

11.79 ± 0.27

4.07 ± 0.29

1.07 ± 0.08

0.26 ± 0.01

2.66 ± 0.49

2.74 ± 0.50

10.79 ± 0.74

92 ± 8