Genetic Parameters and Breeding Values for Racing Performance in Egyptian Arabian Horses

Why It Matters

Low heritability of speed limits direct genetic gains, so using correlated, more heritable morphometric traits offers a practical path to improve racing performance in Arabian horses.

Key Takeaways

• Speed heritability in Egyptian Arabians is very low (h² ≈ 0.04).
• Neck length strongly correlates genetically with girth (r = 0.90).
• Finishing time and speed show strong negative genetic correlation (rG = ‑0.71).
• EBVs for speed range narrowly from –0.115 to +0.115, limiting discrimination.
• Multi‑trait selection index improves ranking despite low individual trait heritability.

Pulse Analysis

Understanding the genetic architecture of racing performance is crucial for Arabian horse breeders, yet speed—a primary performance metric—exhibits minimal heritability in Egyptian lines. This study confirms that environmental factors dominate speed variation, aligning with prior research on equine performance traits. By quantifying the genetic and phenotypic correlations among 24 morphometric measurements, the authors reveal a network of highly interrelated conformation traits, such as upper neck length with girth and topline with back length, that are more reliably inherited.

The practical implication lies in leveraging these correlated traits within a selection framework. A multi‑trait index that combines estimated breeding values for speed, race wins, and distance capitalizes on the modest heritability of conformation traits, delivering clearer differentiation among candidates. Horses like Imbabi Bandr, which topped the index, demonstrate how indirect selection can identify superior genetic merit even when direct performance metrics are noisy. This approach mirrors strategies used in dairy and beef cattle, where correlated traits such as udder depth or muscle depth guide breeding decisions.

For the broader industry, integrating morphometric data into routine genetic evaluations could accelerate genetic progress without compromising short‑term performance. Breeders should invest in standardized measurement protocols and maintain comprehensive performance records to refine the selection index over time. Simultaneously, optimizing training, nutrition, and jockey expertise remains essential, as environmental improvements will continue to drive immediate race outcomes while genetic gains accrue more gradually through informed, indirect selection.