Egg Shape Index of Chicken Egg

Correct Answer: 74

The Egg Shape Index (ESI) of a standard chicken egg is 74. ESI represents the ratio of maximum width to maximum length of the egg, expressed as a percentage.

ESI Formula

ESI = (Maximum width / Maximum length) × 100

ESI of Different Poultry Species

Interpretation of ESI

• Higher ESI (e.g., 78–80) → more rounded egg shape.
• Lower ESI (e.g., 68–70) → more elongated egg shape.
• Ideal ESI for hatching: close to 74 for chicken (neither too round nor too elongated).

Why Other Options Are Wrong

• 72 → ESI of duck egg, not chicken.
• 76, 80 → higher than the standard chicken ESI of 74.