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Age (wk)
0–6
6–12
12–18
18 to 1st Egg
White-Egg Layers
Body weight (g)b
450
980
1,375
1,475
Protein
18
16
15
17
Arginine
1.0
0.83
0.67
0.75
Lysine
0.85
0.60
0.45
0.52
Methionine
0.30
0.25
0.20
0.22
Methionine + cystine
0.62
0.42
0.47
Threonine
0.68
0.57
0.37
Tryptophan
0.17
0.14
0.11
0.12
Calcium
0.90
0.80
2.00
Phosphorus, available
0.40
0.35
0.32
Brown-Egg Layers
500
1,100
1,500
1,600
14
0.94
0.78
0.72
0.56
0.49
0.28
0.23
0.19
0.21
0.59
0.39
0.44
0.64
0.53
0.16
0.13
0.10
1.8
a Requirements are listed as percentages of diet. Nutrient levels should be adjusted to meet specific strain requirements, level of feed intake, and body weight and skeletal development.
b Average body weight at end of each period.