Heterosis (Hybrid Vigour) Calculator
Calculate heterosis (hybrid vigour) as the percentage by which crossbred performance exceeds the parent-breed average.
Heterosis % = (crossbred mean − parent average) ÷ parent average × 100. Crossbreeding two breeds often gives offspring that outperform the average of both parents, especially for low-heritability traits like fertility and survival. It's the genetic basis of crossbred dairy and broiler stock.
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 Heterosis (Hybrid Vigour) Calculator for an accurate answer in seconds — no formulas to remember, works offline at the farm.
About Heterosis (Hybrid Vigour) Calculator
Heterosis, or hybrid vigour, is the boost in performance crossbred offspring show over the average of their two parent breeds. It is strongest for traits with low heritability — fertility, survivability, hardiness — which is exactly why crossbreeding (such as exotic × indigenous dairy cattle, or commercial broiler and pig crosses) is so widely used. This tool quantifies heterosis as a percentage from the crossbred mean and the parent-breed average, helping you judge the real gain a cross is delivering.
How to use Heterosis (Hybrid Vigour) 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 Heterosis (Hybrid Vigour) 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 heterosis or hybrid vigour?+
It's the amount by which crossbred offspring outperform the average of their two parent breeds, expressed as a percentage. It arises from increased heterozygosity and is largest for low-heritability fitness traits like fertility, viability and disease resistance.
Why does heterosis decline after the F1 generation?+
F1 crossbreds are maximally heterozygous and show full heterosis. In later generations (F2, backcrosses) heterozygosity is partly lost, so heterosis falls. Structured crossbreeding systems (rotational or terminal) are designed to retain as much heterosis as possible.
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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