Dairy Cow Feed Calculator
Calculate daily Total Mixed Ration (TMR) as-fed weight, Dry Matter Intake (DMI), total herd TMR tonnage, Income Over Feed Cost (IOFC), and milk feed efficiency.
Calculate Lactating Dairy Cow TMR Ration
Enter cow body weight, daily milk production (lbs/day), TMR DM %, herd head count, milk price, and TMR cost.
Calculation Results
Calculated using NRC Dairy Cattle Nutrition standards: \text{DMI (lbs)} = (0.02 \times \text{Body Weight}) + (0.3 \times \text{Daily Milk Lbs})
Quick Summary
The Dairy Cow Feed Calculator evaluates high-producing lactating cow feed intake ($\text{DMI} = 0.02 \text{Weight} + 0.3 \text{Milk}$), as-fed TMR wagon loads, Income Over Feed Cost (IOFC), and feed efficiency.
Formula Explanation
\text{Dry Matter Intake DMI (lbs)} = (0.02 \times \text{Cow Weight}) + (0.3 \times \text{Daily Milk Lbs})
\text{As-Fed TMR Ration (lbs)} = \frac{\text{Daily DMI (lbs)}}{\text{TMR Dry Matter \% / 100}}
\text{IOFC (\$/cow/day)} = \text{Daily Milk Revenue} - \text{Daily Feed Cost}How It Works
Lactating dairy cows require massive nutrient throughput to sustain milk yield. The Dairy Cow Feed Calculator applies National Research Council (NRC) dairy energy equations, calculating exact scale weight for Total Mixed Ration (TMR) mixer wagons and tracking Income Over Feed Cost (IOFC).
Step-by-Step Worked Example
Practical Problem: A 1,400 lb Holstein cow produces 85 lbs of milk daily ($22.00/cwt). The TMR is 52% dry matter costing $260/ton as-fed. Calculate daily DMI, as-fed TMR weight, daily feed cost, and IOFC.
- Step 1: Calculate daily DMI per cow: $(0.02 \times 1,400) + (0.3 \times 85) = 28.0 + 25.5 = \mathbf{53.5\text{ lbs DMI/cow/day}}$.
- Step 2: Calculate as-fed TMR weight (52% DM): $53.5 / 0.52 = \mathbf{102.88\text{ lbs as-fed TMR/cow/day}}$.
- Step 3: Calculate daily milk revenue: $(85 / 100) \times \$22.00 = \mathbf{\$18.70\text{ revenue/cow/day}}$.
- Step 4: Calculate daily feed cost: $(102.88 / 2,000) \times \$260 = \mathbf{\$13.37\text{ feed cost/cow/day}}$.
- Step 5: Calculate Income Over Feed Cost (IOFC): $\$18.70 - \$13.37 = \mathbf{\$5.33\text{ IOFC/cow/day}}$ (Feed Efficiency $= 85 / 53.5 = 1.59$).
Real-World Calculation Examples
Scenario 1: High Production Holstein (85 lbs Milk)
Parameters: 1,400 lbs wt, 85 lbs milk, 52% TMR DM
Result: 102.9 lbs TMR as-fed/day (53.5 lbs DMI, $5.33 IOFC/cow/day).
Scenario 2: Peak 100 lb Milk Producer
Parameters: 1,450 lbs wt, 100 lbs milk, 50% TMR DM
Result: 118.0 lbs TMR as-fed/day (59.0 lbs DMI, high energy ration).
Scenario 3: Jersey Herd (65 lbs Milk, 1,000 lbs Weight)
Parameters: 1,000 lbs wt, 65 lbs milk, 54% TMR DM
Result: 73.1 lbs TMR as-fed/day (39.5 lbs DMI, high fat milk production).
Scenario 4: 500-Cow Commercial Dairy Herd
Parameters: 500 cows, 85 lbs milk average
Result: 25.7 short tons TMR mixed daily (51,440 lbs total TMR feed).
Key Benefits of Using This Calculator
IOFC Profitability Tracking
Calculates Income Over Feed Cost ($/cow/day), the primary financial health indicator for dairy farms.
TMR Mixer Wagon Loading
Translates DMI targets into exact scale weights for loading TMR feed mixer wagons.
Milk Feed Efficiency Index
Computes lbs milk produced per lb DMI consumed (target 1.4 to 1.6 lbs milk / lb DMI).
100% Free & Client-Side
Executes locally in your browser with zero latency or web server transmission.
Frequently Asked Questions (FAQ)
What is Total Mixed Ration (TMR) in dairy farming?
TMR is a homogenous mixture of forages (corn silage, alfalfa haylage), grains, protein supplements, minerals, and vitamins blended so every bite delivers balanced nutrition.
What is Income Over Feed Cost (IOFC)?
IOFC is gross milk revenue per cow minus daily feed cost per cow ($\text{IOFC} = \text{Milk Revenue} - \text{Feed Cost}$). It measures funds available for fixed costs, labor, and profit.
What is good feed efficiency in lactating dairy cows?
Target feed efficiency is 1.4 to 1.6 lbs of 3.5% Fat-Corrected Milk (FCM) produced per 1.0 lb of Dry Matter Intake (DMI).
How much water does a lactating dairy cow drink per day?
A high-producing dairy cow producing 85 lbs of milk drinks 35 to 50 gallons of fresh water per day (4 lbs water per 1 lb milk).
What percentage of body weight does a dairy cow eat in DMI?
High-producing lactating dairy cows consume 3.5% to 4.2% of body weight in DMI per day.
Why is TMR dry matter % critical for feeding consistency?
Silage moisture changes after rain. If silage dry matter drops from 35% to 30%, feeding the same wet weight reduces actual dry matter intake, dropping milk production.
What is physically effective Neutral Detergent Fiber (peNDF)?
peNDF measures long forage fiber length required to stimulate cud chewing and saliva bicarbonate production, preventing subacute rumen acidosis (SARA).
What Crude Protein % is required in lactating dairy TMR?
Early lactation high-producing cow TMR rations require 16.5% to 17.5% Crude Protein (CP).
What is rumen-degradable protein (RDP) vs bypass protein (RUP)?
RDP feeds rumen microbes; RUP (rumen-undegradable protein) passes intact into the abomasum to directly supply essential amino acids for milk synthesis.
How much feed refusal (bunk weigh-back) should be targeted?
Target 3% to 5% unconsumed TMR refusal left in the feed bunk to ensure cows are never limited by feed availability.