Topics:
Animal Refresher, Poultry Science
Instrument Used to Measure Egg Shell Strength
Egg Shape Index (ESI) of an egg is measured by Vernier caliper, while shell strength is measured by:
- Vernier caliper
- Screw gauge — Correct Answer
- Brine floatation technique
- Micrometer
Explanation:
Correct Answer: Screw gauge
Shell strength (and shell thickness) are measured using a Screw gauge. Shell strength is directly proportional to shell thickness.
Vernier Caliper vs. Screw Gauge
- Vernier caliper: Measures external dimensions with accuracy of 0.1 mm → used for ESI (egg length and width).
- Screw gauge (micrometer screw gauge): Measures much smaller distances with accuracy of 0.01 mm → used for shell thickness (0.30–0.50 mm).
ESI Formula
ESI = (Maximum width / Maximum length) × 100
- ESI of chicken egg: 74
- ESI of duck egg: 72
- ESI of quail egg: 78
- High ESI = more rounded egg; Low ESI = more elongated egg.
Why Other Options Are Wrong
- Vernier caliper → used for ESI, not shell strength.
- Brine flotation → used for specific gravity, not shell strength.
- Micrometer → although similar to screw gauge, the standard term used is 'Screw gauge' in poultry science.
📚 About this Topic — Animal Refresher
This multiple choice question is from Animal Refresher, Poultry Science. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
