Merck Manual

Please confirm that you are a health care professional

Nutrient Requirements of Growing Beef Bulls a

Nutrient Requirements of Growing Beef Bulls a

Body Weight in kg (lb)

300 (660)

400 (880)

500 (1,100)

600 (1,320)

700 (1,540)

800 (1,760)

Maintenance requirement

NEm (Mcal/day)

6.38

7.92

9.36

10.73

12.05

13.32

MP (g/day)

274

340

402

461

517

572

Calcium (g/day)

9

12

15

19

22

25

Phosphorus (g/day)

7

10

12

14

17

19

Growth requirement (Average daily gain in kg [lb])

NEg required for gain (Mcal/day)

0.5 (1.1)

1.72

2.13

2.52

2.89

3.25

3.59

1.0 (2.2)

3.68

4.56

5.39

6.18

6.94

7.67

1.5 (3.3)

5.74

7.12

8.42

9.65

10.83

11.97

2.0 (4.4)

7.87

9.76

11.54

13.23

14.85

16.41

2.5 (5.5)

10.05

12.47

14.74

16.90

18.97

20.97

MP required for gain (g/day)

0.5 (1.1)

158

145

122

100

78

58

1.0 (2.2)

303

272

222

175

130

86

1.5 (3.3)

442

392

314

241

170

102

2.0 (4.4)

577

506

400

299

202

109

2.5 (5.5)

710

617

481

352

228

109

Calcium required for gain (g/day)

0.5 (1.1)

12

10

9

7

6

4

1.0 (2.2)

23

19

16

12

9

6

1.5 (3.3)

33

27

22

17

12

7

2.0 (4.4)

43

35

28

21

14

8

2.5 (5.5)

53

43

34

25

16

8

Phosphorus required for gain (g/day)

0.5 (1.1)

5

4

3

3

2

2

1.0 (2.2)

9

8

6

5

4

2

1.5 (3.3)

13

11

9

7

5

3

2.0 (4.4)

18

14

11

8

6

3

2.5 (5.5)

22

17

14

10

6

3

a Weight at maturity, 890 kg (1,958 lb); breed code Angus; see Table: Mean Nutrient Content of Feeds Commonly Used in Beef Cattle Diets a for abbreviations. Vitamin A should be added at a level of 2,200 IU/kg (1,000 IU/lb) feed dry matter.

Adapted, with permission, from Nutrient Requirements of Beef Cattle, 2000, National Academy of Sciences, National Academy Press, Washington, DC.