This not-so-clear picture is about how can simplex indigestion happen. The simplex indigestion is a digestive syndrome disorder which is come from  rumen or reticulum. It can be marked with a loss of ruminal movement or weakness of ruminal tones, which cause a accumulation of ingested food inside the rumen.

When there're abundant amount of ingested foods inside the rumen, it will stimulate the rumen to becomes Hypermotility in order to process it. The ruminal muscle will be exhausted as a result and it will lead to ruminal atony.

A high protein food also can be a cause simplex indigestion. It will increase the ruminal pH and acid-resistant bacteria will be death. The biochemist digestion won't be completed and as a result it will cause an accumulation of ingested food inside the rumen which leads to ruminal atony.

It's about fever. According to Guyton (1997), fever is happened because a pyrogenic reaction. Pyrogen (bacteria, bacterial toxin, virus, etc) can create fever when they're inside the bloodstream. It will be fagosited by macrophage and neutrophil.

The macrophage will produce Inter Leukin-1 (IL-1), also called endogenous pyrogen which increase cyclooxygenase enzyme. That enzyme will transform the arachidonic acid becomes prostaglandin E2 (PGE2) which works at hypothalamus to create fever.