Use this dry matter intake calculator to estimate daily dry matter intake and as-fed feed requirements based on animal weight, intake percentage, feed dry matter, and herd size.
Why Dry Matter Intake Matters
Dry matter intake is an important part of livestock feeding because feeds contain different amounts of moisture.
Comparing feeds only by their as-fed weight can make it difficult to accurately evaluate actual feed consumption. Estimating intake on a dry matter basis helps producers better understand the amount of feed material animals consume after water is excluded.
What This Dry Matter Intake Calculator Does
This dry matter intake calculator estimates daily dry matter intake per animal and converts that amount into an estimated as-fed feed requirement.
The calculator can also estimate total daily dry matter intake and total as-fed feed requirements for an entire herd.
Producers can use these estimates when planning feed inventory, comparing feeds, and estimating future feed requirements.
Dry Matter Intake Formula
Dry Matter Intake = Animal Weight × Dry Matter Intake Percentage
As-Fed Intake = Dry Matter Intake ÷ Feed Dry Matter Percentage
The dry matter and feed dry matter percentages must be converted to decimal values when performing the calculation.
For example, 2.5% becomes 0.025 and 85% becomes 0.85.
Example Dry Matter Intake Calculation
Suppose a producer has cattle averaging 1,200 pounds and estimates dry matter intake at 2.5% of body weight.
Dry matter intake per animal:
1,200 × 0.025 = 30 pounds per day
If the feed is 85% dry matter:
30 ÷ 0.85 = 35.29 pounds as-fed per day
For a herd of 50 animals:
30 × 50 = 1,500 pounds of dry matter per day
35.29 × 50 = approximately 1,764.71 pounds of as-fed feed per day
This calculation helps producers estimate actual feed requirements while accounting for moisture in the feed.
Why Dry Matter and As-Fed Intake Are Different
Feed weight includes both dry matter and water.
Dry feeds generally contain a higher percentage of dry matter, while wetter feeds may contain significantly more moisture.
Two feeds with the same as-fed weight may provide different amounts of actual dry matter.
Converting feed requirements to an as-fed basis helps producers estimate how much feed may actually need to be delivered or offered to livestock.
Factors That Affect Dry Matter Intake
Dry matter intake can be affected by several factors, including:
- Animal weight
- Animal age
- Production stage
- Feed quality
- Forage digestibility
- Weather conditions
- Water availability
- Health status
- Feed moisture
Actual feed intake may change as animals grow or as feeding and environmental conditions change.
How Farmers Use Dry Matter Intake Estimates
Livestock producers can use dry matter intake estimates to plan feed purchases, evaluate feed inventory, and estimate herd feeding requirements.
Dry matter calculations can also help when comparing hay, silage, and other feeds that contain different moisture levels.
Regularly reviewing feed intake and feed dry matter can improve feed planning and reduce unexpected feed shortages.
Common Mistakes When Estimating Dry Matter Intake
Common mistakes include:
- Confusing dry matter intake with as-fed intake
- Entering percentages as decimals
- Using outdated feed moisture estimates
- Ignoring changes in animal weight
- Assuming all feeds contain the same amount of dry matter
- Failing to update herd size
Using accurate animal weights and current feed information provides more useful estimates.
Related Calculators
You may also want to use these related calculators:
- Feed Inventory Calculator
- Livestock Feed Requirement Calculator
- Livestock Feed Cost Calculator
- Feed Conversion Ratio Calculator
- Feed Cost Per Pound Gain Calculator
Feed intake and feed efficiency are closely connected. Read our guide on Feed Conversion Ratio (FCR): Formula, Meaning, and How to Improve Feed Efficiency to learn how feed consumption relates to livestock performance and production efficiency.