Dairy Cow — Feed Requirements Guide
Dairy cows are high-performance animals bred for maximum milk production, consuming significantly more feed relative to body weight than beef cattle. A Holstein dairy cow averaging 1,400 lbs eats approximately 49 lbs of dry matter daily during peak lactation, with protein requirements of 16-18% crude protein to support milk synthesis. Modern dairy nutrition relies on total mixed rations (TMR) that combine forages, grains, protein supplements, minerals, and vitamins into a balanced diet. The dry matter intake of dairy cows fluctuates substantially across lactation stages, making accurate feeding calculations critical for maintaining milk yield, reproductive performance, and animal health. Proper nutrition during the transition period (3 weeks before to 3 weeks after calving) is particularly important for preventing metabolic disorders.
Dairy Cow Nutritional Requirements by Life Stage
The table below shows how dry matter intake, protein requirements, and feed costs change across the 5 life stages of dairy cow production. Life stage adjustments account for the dramatically different energy and protein demands of lactation, growth, gestation, and maintenance. Click any life stage for a dedicated page with detailed feeding recommendations and management tips.
| Life Stage | DMI Adj. | Daily DMI | Protein % | Daily Protein | Monthly Cost* |
|---|---|---|---|---|---|
| Fresh Cow (0-21 days) | 0.85x | 41.7 lbs | 17.6% | 7.3 lbs | $106.49 |
| Mid Lactation | 1.1x | 53.9 lbs | 16% | 8.6 lbs | $137.81 |
| Late Lactation | 0.95x | 46.6 lbs | 14.4% | 6.7 lbs | $119.02 |
| Dry Period | 0.6x | 29.4 lbs | 12% | 3.5 lbs | $75.17 |
| Replacement Heifer | 1x | 49.0 lbs | 18.4% | 9.0 lbs | $125.28 |
*Monthly cost estimated using grass hay at $150/ton. Actual costs vary by feed type and region.
Recommended Feeds for Dairy Cow
The following feeds meet both the minimum crude protein and TDN requirements for dairy cow at maintenance level (16% protein, 70% TDN) when fed as the sole feed source. In practice, most feeding programs combine multiple feed ingredients to optimize cost and nutritional balance.
| Feed | Protein | TDN | As-Fed/Day | Cost/Ton |
|---|---|---|---|---|
| Soybean Meal | 44% | 84% | 54.4 lbs | $450 |
| Cottonseed Meal | 41% | 75% | 53.9 lbs | $380 |
| Distillers Grains (Dried) | 27% | 86% | 54.4 lbs | $200 |
| Corn Gluten Feed | 21% | 80% | 55.7 lbs | $200 |
| Canola Meal | 36% | 74% | 54.4 lbs | $350 |
| Layer Pellets | 16% | 70% | 54.4 lbs | $400 |
| Broiler Starter | 22% | 78% | 54.4 lbs | $450 |
Feeds Requiring Supplementation
These feeds meet either the protein or TDN requirement but not both, and would need to be combined with other feeds in a balanced ration. The table indicates which nutritional requirement is met and which needs supplementation.
| Feed | Protein | TDN | Protein OK? | TDN OK? |
|---|---|---|---|---|
| Alfalfa Hay | 18% | 58% | Yes | No |
| Corn Silage | 8% | 70% | No | Yes |
| Whole Corn | 9% | 88% | No | Yes |
| Cracked Corn | 9% | 88% | No | Yes |
| Oats | 12% | 70% | No | Yes |
| Barley | 13% | 84% | No | Yes |
| Beet Pulp | 9% | 74% | No | Yes |
| Wheat Bran | 16% | 67% | Yes | No |
| Molasses | 5% | 72% | No | Yes |
| Horse Sweet Feed | 12% | 72% | No | Yes |
Feeding Dairy Cow at Different Body Weights
Body weight directly determines dry matter intake. The table below shows how daily feed requirements change across a range of body weights for dairy cow at maintenance level. Use the calculator for custom weights, life stages, and herd sizes.
| Body Weight | Daily DMI | Daily Protein | Monthly Feed | Annual Feed |
|---|---|---|---|---|
| 840 lbs | 29.4 lbs | 4.7 lbs | 882 lbs | 5.37 tons |
| 1,120 lbs | 39.2 lbs | 6.3 lbs | 1,176 lbs | 7.15 tons |
| 1,400 lbs | 49.0 lbs | 7.8 lbs | 1,470 lbs | 8.94 tons |
| 1,680 lbs | 58.8 lbs | 9.4 lbs | 1,764 lbs | 10.73 tons |
| 2,100 lbs | 73.5 lbs | 11.8 lbs | 2,205 lbs | 13.41 tons |
Herd Size Feed Budgets for Dairy Cow
Planning feed purchases and storage requires estimating total feed needs for your herd over time. The table below shows monthly and annual feed requirements and costs for various herd sizes of dairy cow at maintenance level using grass hay at $150/ton.
| Head Count | Daily DMI Total | Monthly Feed | Annual Feed | Annual Cost |
|---|---|---|---|---|
| 5 | 245.0 lbs | 3.68 tons | 44.71 tons | $7,621.45 |
| 10 | 490.0 lbs | 7.35 tons | 89.43 tons | $15,242.90 |
| 25 | 1,225.0 lbs | 18.38 tons | 223.56 tons | $38,107.24 |
| 50 | 2,450.0 lbs | 36.75 tons | 447.13 tons | $76,214.49 |
| 100 | 4,900.0 lbs | 73.50 tons | 894.25 tons | $152,428.98 |
| 200 | 9,800.0 lbs | 147.00 tons | 1,788.50 tons | $304,857.95 |
Other Animals
Browse feed requirement guides for other livestock species.