Merck Manual

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Nutrient Requirements of Growing Pullets a

Nutrient Requirements of Growing Pullets a

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

0.52

0.42

0.47

Threonine

0.68

0.57

0.37

0.47

Tryptophan

0.17

0.14

0.11

0.12

Calcium

0.90

0.80

0.80

2.00

Phosphorus, available

0.40

0.35

0.30

0.32

Brown-Egg Layers

Body weight (g)b

500

1,100

1,500

1,600

Protein

17

15

14

16

Arginine

0.94

0.78

0.62

0.72

Lysine

0.80

0.56

0.42

0.49

Methionine

0.28

0.23

0.19

0.21

Methionine + cystine

0.59

0.49

0.39

0.44

Threonine

0.64

0.53

0.35

0.44

Tryptophan

0.16

0.13

0.10

0.11

Calcium

0.90

0.80

0.80

1.8

Phosphorus, available

0.40

0.35

0.30

0.35

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.