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Arroba and slaughter point for cattle

See how much the animal is worth in arrobas, in how many days it reaches slaughter weight, and how much the fattening earns per day.

Pre-sizing and estimating tool: the results do not replace a design, calculation, or report signed by a qualified professional, nor verification against the applicable standards.

Preliminary estimateRevision 12/11/2026
Animal
Market and cost

Use the quote from your local market and the actual yield for the category. The default values are examples only.

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—Arroba and slaughter point
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Daily margin by weight gain

Gain per day in feedlot for gains of 0.6 to 1.4 kg; the highlighted bar is yours.

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Animal value by arroba

Current carcass value at different arroba prices; the dot is your price.

Tap the chart to see the values.

What if the data changes?

Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.

Tap the chart to see the values.

Daily gain by weight and arroba

Feedlot gain per day, after the daily cost, for different weight gains and arroba prices, with the entered yield.

Step by step with your numbers

The calculation done in steps, with the values you entered.

    The calculation memo gathers this page's inputs, results, equations, assumptions, and references, with fields for project, responsible person, and review. The full report also includes the charts and interpretations, in color. In the print window, choose Save as PDF.

    How to use

    Enter the current live weight, the daily gain, the carcass yield, the arroba price, the carcass weight you want to reach, and the animal's daily cost. The calculator shows the current value, the days to target, and the net daily gain.

    Worked example

    Animal of 400 kg, gain of 1.0 kg per day, 50% dressing yield, arroba at R$ 300, target of 16 @ and cost of R$ 6.00 per day.

    Carcass = 400 × 0.50 = 200 kg = 13.3 @, worth R$ 4,000. Target live weight = 16 × 15 ÷ 0.50 = 480 kg. Days = (480 − 400) ÷ 1.0 = 80 days. Gain per day = 1.0 × 0.50 ÷ 15 × 300 − 6 = R$ 4.00.

    Precautions

    • Carcass yield changes with category and finish: use data from your packing plant.
    • Weight above the ideal point can reduce gain and increase the cost per arroba.
    • For the feeding cost, see the diet cost per animal and per day.

    Method, assumptions, and references

    Equations used

    Carcass (kg) = Live weight × Carcass yield
    Arrobas (@) = Carcass (kg) ÷ 15
    Days to target = [(Target carcass ÷ Yield) − Live weight] ÷ Daily gain
    Gain per day (R$) = (Daily gain × Yield ÷ 15) × Arroba price − Daily cost

    Assumptions and limits

    • One arroba equals 15 kg of carcass.
    • Constant daily gain; in practice the gain falls with weight and age.
    • Arroba price and daily cost held constant over the period.

    Standards and technical documents

    • Market price reference (Cepea/Esalq) and carcass yield tables for your category.

    Frequently asked questions

    Why is the arroba 15 kg?

    It is the market convention for the carcass. It is measured in kilos of carcass, not live weight.

    Which carcass yield should I use?

    Depends on the category and the diet. Feedlot cattle usually yield more than grazing cattle. Use the actual value for your lot, when possible.

    Why can net daily gain be negative?

    Because the daily cost of fattening can be higher than the animal's gain in value. In that case, keeping the animal costs money.

    Does the result say when to sell?

    It shows the gain per day and the time to target. The decision to sell depends on future prices and the opportunity cost of capital.