Liquid manure in deep anaerobic storage, contains sulfur (from amino acids in feed, manure or in water) which certain bacteria (anaerobes) use as a substitute for oxygen. They produce H₂S as an end product, which is toxic to living tissue, by stopping the energy supplying reactions in the tissue cells.

Illness and injuries can cost serious economic, physical, and emotional health issues that can deter from an efficient and enjoyable production system and home life. In this article, I will list several categories of health and safety issues for workers.