Nutrient Requirements of Growing Beef Bulls a
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Body Weight in kg (lb) |
300 (660) |
400 (880) |
500 (1,100) |
600 (1,320) |
700 (1,540) |
800 (1,760) |
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Maintenance requirement |
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|
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 |
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Growth requirement (Average daily gain in kg [lb]) |
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|
NEg required for gain (Mcal/day) |
|
|
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|
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) |
|
|
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|
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) |
|
|
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|
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) |
|
|
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|
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. |
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Adapted, with permission, from Nutrient Requirements of Beef Cattle, 2000, National Academy of Sciences, National Academy Press, Washington, DC. |
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