Cattle Feed Calculator
Calculate daily forage, hay, and grain ration weights per head, total herd feed tonnage, and Dry Matter Intake (DMI) for beef and dairy cattle.
Calculate Cattle Ration & Forage Breakdown
Enter cattle weight, herd head count, DMI %, forage vs grain ratio, feed DM %, and feeding days.
Calculation Results
Calculated using NRC beef and dairy nutrition standards: \text{Total As-Fed} = \frac{\text{Forage DMI}}{\text{Forage DM\%}} + \frac{\text{Grain DMI}}{\text{Grain DM\%}}
Quick Summary
The Cattle Feed Calculator evaluates daily forage and grain ration proportions ($\text{As-Fed} = \frac{\text{Forage DMI}}{\text{Forage DM\%}} + \frac{\text{Grain DMI}}{\text{Grain DM\%}}$) per head and total herd tonnage for beef and dairy operations.
Formula Explanation
\text{Total DMI per Head (lbs)} = \text{Cattle Weight (lbs)} \times \left(\frac{\text{DMI \%}}{100}\right)
\text{Forage DMI (lbs)} = \text{Total DMI} \times \left(\frac{\text{Forage \%}}{100}\right)
\text{Forage As-Fed (lbs)} = \frac{\text{Forage DMI}}{\text{Forage DM \% / 100}}How It Works
Cattle rations combine fibrous forage (hay, pasture, silage) with energy dense concentrates (corn, distillers grains). The Cattle Feed Calculator separates total Dry Matter Intake (DMI) into forage vs grain components, adjusting for moisture differences between dry hay and high-moisture silage.
Step-by-Step Worked Example
Practical Problem: A 100-head herd of 1,200 lb beef cows requires 2.5% DMI daily. The ration is 80% dry hay (88% DM) and 20% corn grain (88% DM). Calculate daily forage and grain per head and 30-day herd tonnage.
- Step 1: Total DMI per head: $1,200 \times 0.025 = \mathbf{30.0\text{ lbs DMI/head/day}}$.
- Step 2: Forage DMI (80%): $30.0 \times 0.80 = \mathbf{24.0\text{ lbs forage DMI}}$. Grain DMI (20%) $= \mathbf{6.0\text{ lbs grain DMI}}$.
- Step 3: Forage as-fed per head (88% DM): $24.0 / 0.88 = \mathbf{27.27\text{ lbs hay/head/day}}$.
- Step 4: Grain as-fed per head (88% DM): $6.0 / 0.88 = \mathbf{6.82\text{ lbs grain/head/day}}$. Total $= \mathbf{34.09\text{ lbs as-fed}}$.
- Step 5: Total 30-day herd tonnage (100 head): Forage $= (27.27 \times 100 \times 30) / 2,000 = \mathbf{40.91\text{ tons hay}}$; Grain $= \mathbf{10.23\text{ tons grain}}$ ($51.14\text{ tons total}$).
Real-World Calculation Examples
Scenario 1: 1,200 lb Beef Cow (80% Forage)
Parameters: 1,200 lbs wt, 2.5% DMI, 80% hay, 20% grain
Result: 27.3 lbs hay + 6.8 lbs grain/head/day (51.1 tons/month per 100 head).
Scenario 2: Corn Silage Based Ration (50% Silage)
Parameters: 1,200 lbs wt, 2.5% DMI, 50% silage (35% DM), 50% grain
Result: 42.9 lbs silage + 17.0 lbs grain/head/day (59.9 lbs total as-fed).
Scenario 3: 100% All-Hay Winter Maintenance
Parameters: 1,200 lbs wt, 2.0% DMI, 100% dry hay (88% DM)
Result: 27.3 lbs dry hay/head/day (0 lbs grain).
Scenario 4: Finishing Feedlot Steer (85% Grain)
Parameters: 1,000 lbs wt, 2.8% DMI, 15% hay, 85% corn
Result: 4.8 lbs hay + 27.0 lbs corn/head/day (High energy finishing ration).
Key Benefits of Using This Calculator
Separate Hay vs Grain Delivery
Calculates exact scale weights for forage/hay vs grain/concentrate components independently.
Rumen Health Fiber Safety
Monitors forage percentage to ensure minimum effective fiber levels prevent rumen acidosis.
Bale & Grain Inventory Planning
Calculates required 1,000 lb round hay bale counts and corn bushels needed per month.
100% Free & Client-Side
Executes locally in your browser with zero latency or web server transmission.
Frequently Asked Questions (FAQ)
How many pounds of hay does a 1,200 lb cow eat per day?
A 1,200 lb dry beef cow eats 24 to 27 lbs of dry hay per day (2.0% to 2.2% of body weight in DMI).
How many round bales of hay are needed for 100 cows per month?
100 cows eating 27 lbs of hay/day consume ~40.5 tons of hay per month, requiring ~81 round bales (at 1,000 lbs per bale).
What is minimum forage percentage for cattle health?
Cattle require a minimum of 40% forage DMI (or 15% effective NDF fiber) to maintain healthy rumen pH and prevent bloat and acidosis.
How does corn silage differ from dry hay in scale weight?
Corn silage is 65% water (35% DM). You must feed 2.5 times more pounds of corn silage as-fed to equal the dry matter of dry hay (88% DM).
What is Crude Protein (CP) requirement for beef cows?
Dry pregnant beef cows require 7% to 8% CP in total DMI; lactating beef cows require 10% to 12% CP.
How do distillers grains (DDGS) fit into cattle rations?
Dried Distillers Grains with Solubles (DDGS) contain 28% CP and high fat/energy, substituting for corn grain and protein supplements.
How much water does a beef cow drink per day?
A 1,200 lb beef cow drinks 10 to 15 gallons of water per day in winter, and up to 20 to 25 gallons per day in summer heat.
What is Body Condition Score (BCS) in beef cattle?
BCS rates cattle fatness on a scale from 1 (emaciated) to 9 (obese). Target calving BCS is 5.0 to 6.0 for optimal rebreeding.
How does cold stress increase hay intake?
For every 1°F temperature drop below 20°F (lower critical temperature), feed NEm requirement increases by 1%, boosting hay consumption by 10–20%.
How do I convert corn bushels to pounds of cattle feed?
1 bushel of shelled corn weighs 56 lbs ($100\text{ bu} = 5,600\text{ lbs}$).