Genetic Gain (Breeder's Equation) Calculator
Estimate genetic gain per generation and per year using the breeder's equation from heritability, selection differential and generation interval.
The breeder's equation: response R = h² × S (gain per generation), and per year = R ÷ generation interval. Gain rises with heritability, stronger selection (bigger differential) and shorter generation intervals — the four levers of any breeding programme.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Livestock breeders and farm managers use the free Genetic Gain (Breeder's Equation) Calculator for an accurate answer in seconds — no formulas to remember, works offline at the farm.
About Genetic Gain (Breeder's Equation) Calculator
The breeder's equation is the cornerstone of animal improvement: the genetic gain you make in one generation equals the trait's heritability multiplied by the selection differential (how much better your chosen parents are than the herd average). This tool computes that gain per generation and, dividing by the generation interval, the gain per year. It shows exactly how heritability, selection pressure and generation turnover combine to drive — or limit — genetic progress.
How to use Genetic Gain (Breeder's Equation) Calculator
- 1Enter your herd/flock figures into the inputs.
- 2Read the headline result and the supporting breakdown.
- 3Apply the guidance in the note to your breeding decisions.
Why use Genetic Gain (Breeder's Equation) Calculator?
- ✓Uses the standard, citable animal-breeding formula
- ✓Clear inputs with sensible defaults
- ✓Instant result with the working shown
- ✓Free, fully in-browser and private
Frequently asked questions
What is the breeder's equation?+
R = h² × S, where R is the response (genetic gain per generation), h² is heritability and S is the selection differential (the superiority of selected parents over the population mean). Dividing R by the generation interval gives annual genetic gain.
How can I increase genetic gain?+
Increase any of: heritability (better, more accurate measurement), selection differential (select more intensely, from a larger pool), or reduce the generation interval (turn generations over faster). The equation shows each lever's effect directly.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline at the farm and your data never leaves the device.
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