Wouldn't the levels of ammonia in all the urine being expelled reach toxic levels very quickly in a sealed environment?
Hmmm....flashback to the poultry industry, ca. 1965....
Chicken houses, even with the 20,000 chickens removed to meet their fate, are chokingly strong in the ammonia department. And the houses have huge fans at the ends to keep them ventilated, not a single window at the top like Arks do. According to various web sources, the human nose doesn't even detect ammonia until its concentration is 5 to 17 parts per million. The US Permissible Exposure Limit is 50 parts per million, but most other countries use 25 ppm. 300 ppm is "immediately dangerous to life and health."