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Table 2 Effects of increasing mammary glucose supply on milk protein composition in lactating dairy goats

From: AMPK-mTOR pathway is involved in glucose-modulated amino acid sensing and utilization in the mammary glands of lactating goats

Items

Infused glucose, g/d

SEM

P-value

0

20

40

60

80

100

Linear

Quadratic

Cubic

Protein profile, % of milk protein

 αS2-casein

10.6

11.3

12.8

14.3

12.4

11.7

1.05

0.21

0.03

0.52

 β-casein

55.5

52.5

55.0

52.7

54.4

54.2

1.86

0.85

0.53

0.66

 κ-casein

16.6

17.5

15.5

15.0

14.9

15.9

1.00

0.11

0.29

0.15

 α-lactalbumin

3.78

4.07

4.27

5.55

4.15

3.57

0.44

0.90

0.02

0.27

 β-lactoglobulin

13.5

14.7

12.5

12.5

14.1

14.6

1.06

0.65

0.24

0.53

Protein fraction yield, g/d

 αS2-casein

2.81

3.17

3.88

4.66

3.44

3.58

0.28

0.03

< 0.01

0.77

 β-casein

15.1

14.9

16.8

17.4

15.3

16.6

1.09

0.30

0.40

0.87

 κ-casein

4.44

4.95

4.70

4.99

4.17

4.97

0.43

0.87

0.82

0.21

 α-lactalbumin

1.01

1.19

1.30

1.84

1.17

1.12

0.15

0.43

< 0.01

0.48

 β-lactoglobulin

3.60

4.19

3.76

4.07

3.96

4.45

0.33

0.18

0.80

0.31