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Table 10 The optimal dietary arginine levels in laying hen fed with a low-protein diet

From: The optimal dietary arginine level of laying hens fed with low-protein diets

Criteria

Model

Independent variables

Regression equation

Arginine requirement

R2

Laying rate, %

Quadratic polynomial

Dietary Arg level

- 142.27 + 522.09X - 293.71X2

0.89%

0.73

 

Quadratic broken-line

Dietary Arg level

90.67–1731.7(X - 0.85)2 - 27.24(X - 0.85)

0.85%

0.98

Egg mass, g/hen/d

Quadratic polynomial

Dietary Arg level

- 117.81 + 388.79X - 217.43X2

0.89%

0.82

 

Quadratic broken-line

Dietary Arg level

56.45–686.7(X - 0.86)2 - 18.9(X - 0.86)

0.86%

0.97

Feed efficiency

Quadratic polynomial

Dietary Arg level

8.86–14.32X + 8.0X2

0.90%

0.77

 

Quadratic broken-line

Dietary Arg level

2.44 + 26.43(X - 0.86)2 + 0.7(X - 0.86)

0.86%

0.96