Nutrition & Energetics
NRC 2001 / NASEM 2021 Models
Dairy Cow Dry Matter Intake (DMI) Calculator
Predict daily Dry Matter Intake (DMI), 4% Fat-Corrected Milk (FCM), Net Energy for Lactation ($NE_L$), and drinking water requirements for high-producing dairy cows.
Cow & Production Metrics
400 kg (Jersey)
650 kg (Holstein)
850 kg (Heavy)
15 kg
36 kg (Avg)
65 kg (Elite)
3.0%
3.8%
5.5% (Jersey)
Early (10–70)
Peak (70–140)
Late (>200)
Target DMI Intake
24.2 kg/day
3.72% of Body Weight
4% Fat Corrected Milk
34.9 kg/day
Standardized Energy Milk
Net Energy ($NE_L$) Demand
38.4 Mcal/day
10.1 Mcal Maint + 28.3 Milk
Daily Water Demand
118 L / day
31.2 Gallons / cow
📐 Scientific NRC 2001 / NASEM DMI Prediction Model
This tool computes Dry Matter Intake using the classic NRC equation adjusted for lactation stage:
DMI (kg/d) = (0.372 × FCM + 0.0968 × BW^0.75) × (1 - e^(-0.192 × (WIM + 3.67)))
Where FCM is 4% Fat-Corrected Milk, BW^0.75 is metabolic body weight, and WIM is Weeks in Milk.
🤖 How Automated Feed Bunk Vision & Rumination Collars Bridge the Gap
Formulating a perfect Total Mixed Ration (TMR) on paper does not guarantee actual intake. Precision dairy technologies monitor what happens at the bunk 24/7:
- 3D Feed Bunk ToF Cameras: Measures residual feed volume along the feed alley every 30 minutes, automatically notifying mixer wagons to adjust push-up schedules and prevent bunk empty time.
- Rumination Collars & Ear Tags: Healthy cows ruminate 450–520 minutes/day. A sudden 50+ minute drop in rumination is the #1 leading indicator of Subacute Ruminal Acidosis (SARA) or ketosis 36 hours before milk drop.