Table: Nutrient Requirements of Beef Cows a

Nutrient Requirements of Beef Cows ^a

Months Since Calving:	1	2	3	4	5	6	7	8	9	10	11	12

NE_mrequired (Mcal/day)
Maintenance	10.25	10.25	10.25	10.25	10.25	10.25	8.54	8.54	8.54	8.54	8.54	8.54
Lactation	4.78	5.74	5.17	4.13	3.10	2.23	0	0	0	0	0	0
Pregnancy	0	0	0.01	0.03	0.07	0.16	0.32	0.64	1.18	2.08	3.44	5.37
Total	15.03	15.99	15.43	14.41	13.42	12.64	8.87	9.18	9.72	10.62	11.98	13.91
*MP required (g/day)*^b
Maintenance	422	422	422	422	422	422	422	422	422	422	422	422
Lactation	349	418	376	301	226	163	0	0	0	0	0	0
Pregnancy	0	0	1	2	4	7	14	27	50	88	151	251
Total (g)	771	840	799	725	652	592	436	449	472	510	573	673
Total (lb)	1.7	1.9	1.8	1.6	1.4	1.3	1.0	1.0	1.0	1.1	1.3	1.5
*Calcium required (g/day)*^b
Maintenance	16	16	16	16	16	16	16	16	16	16	16	16
Lactation	16	20	18	14	11	8	0	0	0	0	0	0
Pregnancy	0	0	0	0	0	0	0	0	0	12	12	12
Total	32	36	34	30	27	24	16	16	16	28	28	28
*Phosphorus required (g/day)*^b
Maintenance	13	13	13	13	13	13	13	13	13	13	13	13
Lactation	9	11	10	8	6	4	0	0	0	0	0	0
Pregnancy	0	0	0	0	0	0	0	0	0	5	5	5
Total	22	24	23	21	19	17	13	13	13	18	18	18
*Gain in weight from pregnancy/day*^b
Grams	0	0	20	30	50	80	120	190	280	400	570	770
Pounds	0	0	0.04	0.07	0.11	0.18	0.26	0.42	0.62	0.88	1.25	1.70
*Milk production/day*
Kilograms	6.7	8.0	7.2	5.8	4.3	3.1	0	0	0	0	0	0
Pounds	14.7	17.6	15.8	12.8	9.5	6.8	0	0	0	0	0	0
*Weight of conceptus*
Kilograms	0	0	1	1	3	4	7	12	19	29	44	64
Pounds	0	0	2	2	7	9	15	26	42	64	97	141
^a Mature weight, 533 kg (1,172 lb); calf birth weight, 40 kg (88 lb); age at calving, 60 mo; peak milk, 8 kg (17.6 lb); age of calf at weaning, 30 wk; breed code Angus; milk protein, 3.4%; calving interval, 12 mo; see Table: Mean Nutrient Content of Feeds Commonly Used in Beef Cattle Diets ^a Mean Nutrient Content of Feeds Commonly Used in Beef Cattle Diets ^a for abbreviations. Crystalline vitamin A should be added at a level of 2,200 IU/kg (1,000 IU/lb) dry matter feed.
^b No allowance made for gain because these are mature cows.
Adapted, with permission, from Nutrient Requirements of Beef Cattle, 2000, National Academy of Sciences, National Academy Press, Washington, DC.

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Nutrient Requirements of Beef Cows ^a