Topics:
Animal Refresher, Poultry Science
CO₂ Level in Incubator That Causes 100% Embryo Death
During incubation, if the CO₂ concentration in the incubator rises above ______%, all embryos die and hatchability becomes zero:
- 1%
- 3%
- 5% — Correct Answer
- 10%
Explanation:
Correct Answer: 5%
If the CO₂ level in the incubator rises above 5% for a prolonged period, all embryos die and hatchability becomes zero.
CO₂ Effects on Hatchability
- Optimum CO₂ level: 0.5%
- For every 1% rise in CO₂ beyond 0.5% → embryonic mortality rises progressively.
- Above 5% CO₂ → all embryos die → hatchability = 0%.
O₂ Effects on Hatchability
- Optimum O₂ level: 21%
- For every 1% fall in O₂ from 21% → hatchability drops by 5%.
- For every 1% rise in O₂ from 21% → hatchability rises by 5%.
Ventilation Problems and Their Consequences
- Poor ventilation → accumulation of CO₂ and NH₃, wet litter, dead embryos.
- CO₂ > 5% is directly lethal to embryos.
- NH₃ maximum permissible in poultry house: 25 ppm.
Why Other Options Are Wrong
- 1% → causes elevated embryonic mortality but not complete death.
- 3% → causes significant mortality but hatchability is not zero yet.
- 10% → too high an estimate; lethality occurs at 5%.
📚 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.
