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Guide 6: Pedigree & COI

Breeding Strategy

What is COI?

The Coefficient of Inbreeding (COI) represents the probability that a horse has inherited two identical copies of a gene from a common ancestor.

High COI (8-15%)

Intense inbreeding. Can "fix" traits but carries higher risk of genetic defects and lower health stats.

Low COI (0-5%)

Outcross. Introduces genetic diversity and hybrid vigor, leading to better consistency.

🎯 Best Practice

Aim for a moderate COI (around 3-5%) to preserve bloodline quality while avoiding extreme risks. Stable Tracker uses Wright's formula over 6 generations.