toolbox
Home / Farming, Animals & Pets / Pig Feed Yield Forecast Estimator

Pig Feed Yield Forecast Estimator

Forecast the total live-weight gain a group of pigs may produce from an expected starting population, average daily gain, and production period. An optional completion percentage lets you reduce the initial pig count when not every pig is expected to remain in the modeled group through the end of the period.

The result is a simple performance forecast built from user-entered assumptions rather than a growth curve. It can help with feed procurement, barn throughput planning, sale-weight scenarios, or comparing the effect of different daily-gain assumptions. Real results can differ because growth rate changes with starting weight, genetics, health, diet, environment, stocking density, and removals. For that reason, use realistic values for the particular group instead of treating the default figures as production standards.

Pig gain forecast inputs

pigs
kg/day
days
%
Result
—
forecast group live-weight gain
Pigs represented at completion—
Gain per completing pig—
Average gain per starting pig—

1. Enter starting pig count
Use the number of pigs at the beginning of the forecast period.

2. Set expected daily gain
Enter the average kilograms of live-weight gain per pig per day you want to model.

3. Choose the number of days
Use the length of the production period covered by the daily-gain assumption.

4. Apply a completion percentage
Use 100% if all starting pigs are modeled through completion, or a lower percentage to reduce the represented finishing count.

5. Review total and per-pig gain
The main result forecasts group gain; supporting results show completion count and gain per completing pig.

Completing pigs = Starting pig count × (Completion percentage ÷ 100)Gain per completing pig = Average daily gain × DaysForecast group gain = Completing pigs × Gain per completing pig

Where:

  • Starting pig count = pigs at the start of the forecast
  • Completion percentage = share of starting pigs represented through the full period
  • Average daily gain = expected kg gained per pig per day
  • Days = length of the forecast period

Assumptions: The model treats average daily gain as constant across the selected period and applies the same gain to the modeled completing pigs.

What the result means

The main result is the projected combined live-weight gain for the pigs represented by the completion assumption.

This is a scenario estimate, not a biological growth model; actual daily gain may change across weight stages and production conditions.

Given

  • Starting pigs: 150
  • Expected ADG: 0.84 kg/day
  • Period: 63 days
  • Completion: 97%

Calculation
Completing pigs = 150 × 0.97 = 145.5 pigs (an expected-count value).
Gain per completing pig = 0.84 × 63 = 52.92 kg.
Forecast group gain = 145.5 × 52.92 = 7,699.86 kg.

Result
7,699.86 kg

Interpretation
The scenario represents an expected completion count and forecasts about 7.70 metric tons of combined live-weight gain.

Why can the completion count be fractional?

The calculator treats completion percentage as an expected proportion for forecasting, so the intermediate count can be fractional. Actual pig counts are whole animals, but expected-value planning can still use decimals.

Does the forecast include starting body weight?

No. It forecasts weight gain, not final live weight. To estimate final group weight, starting live weight would need to be added separately.

Can I change average daily gain for different growth phases?

This page uses one average daily gain for the entire period. For phase-specific planning, calculate each phase separately and sum the forecast gains.

What does a 100% completion percentage mean?

It means every starting pig is included for the full modeled period. It does not guarantee that all pigs will actually remain in production.

How does this differ from the pig feed conversion calculator?

This estimator projects gain from time and daily gain assumptions. The feed conversion calculator evaluates recorded or assumed feed use relative to weight gain.