1. What is the TMR Energy Equation?

The Total Mixed Ration (TMR) energy equation calculates the Total Digestible Nutrients (TDN) of a mixed feed by summing the product of each ingredient's TDN value and its proportion in the ration.

2. How Does the Calculator Work?

The calculator uses the TMR equation:

Where:

• \( ingredient\_TDN \) — Total Digestible Nutrients percentage of each ingredient
• \( proportion \) — Decimal proportion of each ingredient in the ration (sum should be ≤ 1)

Explanation: The equation calculates the weighted average of TDN values based on the proportion of each ingredient in the total ration.

3. Importance of TDN Calculation

Details: TDN is a measure of the energy value in feed for livestock. Accurate TDN calculation helps in formulating balanced rations that meet animals' nutritional requirements.

4. Using the Calculator

Tips: Enter TDN values as percentages (0-100%) and proportions as decimals (0-1). At least one ingredient is required, but you can calculate up to three ingredients.

5. Frequently Asked Questions (FAQ)

Q1: What is a good TDN value for livestock feed?
A: Optimal TDN varies by animal type and production stage, but generally ranges from 55-75% for most livestock.

Q2: How many ingredients can I include in the calculation?
A: This calculator handles up to 3 ingredients, but you can perform additional calculations for more complex rations.

Q3: Should the proportions add up to 1?
A: Ideally yes, as proportions represent the fraction of each ingredient in the total ration. The calculator will work with any values but results are most meaningful when proportions sum to 1.

Q4: Where can I find TDN values for common feed ingredients?
A: TDN values are available in feed composition tables from agricultural extension services or nutrition references.

Q5: Can I use this for other nutrient calculations?
A: The same weighted average approach can be used for protein, fiber, or other nutrients by substituting TDN with the nutrient of interest.