Topics:
Animal Refresher, Poultry Science
Maximum Permissible NH₃ Limit in Poultry House
Maximum permissible limit of NH₃ in poultry house should be:
- 5 ppm
- 15 ppm
- 25 ppm — Correct Answer
- 50 ppm
Explanation:
Correct Answer: 25 ppm
The maximum permissible limit of ammonia (NH₃) in a poultry house is 25 ppm. Above this level, it causes significant health problems in birds.
Effects of High NH₃ Levels
- Respiratory tract irritation: Damages the epithelial lining, increasing susceptibility to Chronic Respiratory Disease (CRD), caused by Mycoplasma gallisepticum.
- Eye damage (Keratoconjunctivitis): Blindness, eye ulcers.
- Reduced growth and production: Feed intake and egg production decline.
- Wet litter: Ammonia and wet litter go hand-in-hand — wet litter produces more ammonia.
How to Control NH₃ in Poultry Houses
- Ensure adequate ventilation.
- Add superphosphate or hydrated lime to litter at 0.5 kg per 15 sq ft of floor space.
- Turn litter at least once weekly.
- Maintain litter depth at 8–12 inches (deep litter system).
📚 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.
