Enteritis is more involve to immunosuppressive agent both intrinsic and extrinsic agent, so maybe complex causative or multiple causes/factors.
Enteritis causes inflammation of epithelial cells causing the immune system to consume a lot of nutrients to deal with inflammation, reducing the amount of nutrients for muscle growth. A stressed gastrointestinal will cause stress that activates the immune system. This will lead to stunted growth and loss of weight and high mortality and costs in managing the condition.