Nutrient Requirements of Pregnant Replacement Beef Cows a
|
Months Since Conception: |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
|
|
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|
NEmrequired (Mcal/day) |
|||||||||
|
Maintenance |
5.98 |
6.14 |
6.30 |
6.46 |
6.61 |
6.77 |
6.92 |
7.07 |
7.23 |
|
Growth |
2.29 |
2.36 |
2.42 |
2.48 |
2.54 |
2.59 |
2.65 |
2.71 |
2.77 |
|
Pregnancy |
0.03 |
0.07 |
0.16 |
0.32 |
0.64 |
1.18 |
2.08 |
3.44 |
5.37 |
|
Total |
8.31 |
8.57 |
8.87 |
9.26 |
9.79 |
10.55 |
11.65 |
13.23 |
15.37 |
|
MP required (g/day) |
|||||||||
|
Maintenance |
295 |
303 |
311 |
319 |
326 |
334 |
342 |
349 |
357 |
|
Growth |
118 |
119 |
119 |
119 |
119 |
117 |
115 |
113 |
110 |
|
Pregnancy |
2 |
4 |
7 |
18 |
27 |
50 |
88 |
151 |
251 |
|
Total |
415 |
425 |
437 |
457 |
472 |
501 |
545 |
613 |
718 |
|
Calcium required (g/day) |
|||||||||
|
Maintenance |
10 |
11 |
11 |
11 |
12 |
12 |
12 |
13 |
13 |
|
Growth |
9 |
9 |
9 |
8 |
8 |
8 |
8 |
8 |
8 |
|
Pregnancy |
0 |
0 |
0 |
0 |
0 |
0 |
12 |
12 |
12 |
|
Total |
19 |
19 |
20 |
20 |
20 |
20 |
33 |
33 |
33 |
|
Phosphorus required (g/day) |
|||||||||
|
Maintenance |
8 |
8 |
8 |
9 |
9 |
9 |
10 |
10 |
10 |
|
Growth |
4 |
4 |
3 |
3 |
3 |
3 |
3 |
3 |
3 |
|
Pregnancy |
0 |
0 |
0 |
0 |
0 |
0 |
7 |
7 |
7 |
|
Total |
12 |
12 |
12 |
12 |
12 |
13 |
20 |
20 |
20 |
|
Average daily gain (kg/day) |
|||||||||
|
Growth |
0.39 |
0.39 |
0.39 |
0.39 |
0.39 |
0.39 |
0.39 |
0.39 |
0.39 |
|
Pregnancy |
0.03 |
0.05 |
0.08 |
0.12 |
0.19 |
0.28 |
0.40 |
0.57 |
0.77 |
|
Total |
0.42 |
0.44 |
0.47 |
0.51 |
0.58 |
0.67 |
0.79 |
0.96 |
1.16 |
|
Body wt (kg) |
|||||||||
|
Shrunk body |
332 |
343 |
355 |
367 |
379 |
391 |
403 |
415 |
426 |
|
Gravid uterus mass |
1 |
3 |
4 |
7 |
12 |
19 |
29 |
44 |
64 |
|
Total (kg) |
333 |
346 |
359 |
374 |
391 |
410 |
432 |
459 |
490 |
|
Total (lb) |
733 |
761 |
790 |
823 |
860 |
902 |
950 |
1,010 |
1,078 |
|
a Mature weight, 533 kg (1,173 lb); calf birth weight, 40 kg (88 lb); age at breeding, 15 mo; breed code Angus; see Table: Mean Nutrient Content of Feeds Commonly Used in Beef Cattle Diets a for abbreviations. The concentration of vitamin A in all diets should be 2,200 IU/kg (1,000 IU/lb) of dry matter. Adapted, with permission, from Nutrient Requirements of Beef Cattle, 2000, National Academy of Sciences, National Academy Press, Washington, DC. |
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