Facial excema in sheep

Facial eczema FE occurs when sheep, deer and cattle graze spores from the fungus Pithomyces chartarum containing the toxin sporidesmin. The toxin damages the liver leading to a secondary photosensitivity. Underlying liver damage is often subclinical leading to reduced lifetime performance and profitability. The fungus grows on dead matter at the base of the pasture sward and takes off under favourable environmental conditions, such as high humidity, warmth, and moisture.
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Facial eczema – Learn more & be prepared

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Facial eczema devastating flocks - NZ Herald

Animals get FE after eating large numbers of fungal spores Pithomyces chartarum which contain the toxin sporidesmin. Photosensitivity occurs because the FE damaged liver cannot breakdown grass pigments from grass that the animal has eaten. However these classical skin lesions are only the tip of the iceberg but that is what everybody sees on the outside. The real impact comes from the liver damage caused by the sporidesmin. The effect of FE at the individual farm level is related to both the challenge on the pasture and the ability of the animal to withstand that challenge. In high risk regions we could expect a reasonable level of natural selection for tolerance and some studs are breeding rams that are genetically tolerant.
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Facial Eczema

In this mycotoxic disease of grazing livestock, the toxic liver injury commonly results in photodynamic dermatitis. In sheep, the face is the only site of the body readily exposed to ultraviolet light, hence the common name. Sheep, cattle, and farmed deer of all ages can contract the disease, but it is most severe in young animals.
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Facial eczema , FE , is a disease that mainly affects ruminants such as cattle , sheep , deer , goats , and South American camelids alpaca , llamas. It is caused by the fungus Pithomyces chartarum that under favorable conditions can rapidly disseminate in pastures. The spores of the fungus release the mycotoxin sporidesmin in the gastrointestinal tract , causing a blockage in the bile ducts that leads to injury of the liver. Bile , chlorophyll , and other waste products consequently build up in the bloodstream , causing photosensitivity of the skin, especially that exposed to direct sunlight. This, in turn, causes severe skin irritation that the animal attempts to relieve by rubbing its head against available objects, resulting in peeling of the skin.
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