Psoroptic Mange in Cows

Psoroptic mange is a parasitic skin disease caused by the surface-dwelling mite Psoroptes ovis. In cattle, these mites live on the skin rather than burrowing deeply. They feed on skin debris and tissue fluids, which triggers marked irritation and inflammation. The result is a very itchy, crusting dermatitis that can spread through close contact within a group.

In cattle, lesions often develop around the base of the tail, back, and flanks. Affected animals may rub fences, lick themselves excessively, and develop thick scabs, hair loss, and moist skin lesions. Secondary bacterial infection can happen when the skin barrier is damaged.

This condition matters because it can reduce comfort, damage hides, and affect weight gain or production when infestations are heavy. It is also contagious among cattle and can affect sheep and goats, so herd-level planning is often part of treatment. Your vet can help confirm whether the problem is truly psoroptic mange or another skin disease that looks similar.

Psoroptic mange is caused by infestation with Psoroptes ovis, a non-burrowing mite. The mites spread mainly through direct contact between animals. Shared housing, crowding, transport, commingling with newly purchased cattle, and contact with infested sheep or goats can all increase risk.

Once on the skin, the mites irritate the surface and trigger inflammation. That irritation leads to itching, self-trauma, crusting, and hair loss. Secondary bacterial infection may develop if the skin becomes damaged enough.

Outbreaks are often more noticeable when cattle are housed closely together or during cooler months, when coats are heavier and animals spend more time in close quarters. Poor biosecurity, delayed isolation of new arrivals, and failure to treat in-contact animals can allow the infestation to persist within a herd.

Your vet usually starts with a skin exam and a close look at where the lesions are located. Psoroptic mange in cattle commonly affects the base of the tail, back, and flanks, and it tends to cause severe itching with thick crusts and hair loss. That pattern can raise suspicion, but it is not enough to confirm the diagnosis by itself.

Diagnosis is typically confirmed with a superficial skin scraping from the edge of an active lesion, followed by microscopic identification of the mites. Your vet may collect samples from more than one site because parasite numbers can vary from place to place.

Other conditions can look similar, including lice, ringworm, chorioptic mange, sarcoptic mange, photosensitization, allergic skin disease, and bacterial dermatitis. If the first sample is negative but suspicion remains high, your vet may repeat skin scrapings or recommend additional testing. In herd cases, diagnosis often includes evaluating recent animal movement, housing, and whether other species on the property may be involved.

Prevention starts with biosecurity. Isolate newly purchased or returning cattle before mixing them with the herd, and ask your vet whether skin checks or preventive parasite control make sense for your operation. This is especially important if animals come from sales, shared grazing situations, or farms with a recent history of skin disease.

Reduce opportunities for spread by avoiding unnecessary crowding and by paying attention to shared contact points such as chutes, trailers, grooming tools, and fence lines. If sheep or goats are present on the property, discuss cross-species risk with your vet because Psoroptes ovis can affect more than one species.

Routine observation matters. Catching early itching, rubbing, or crusting lesions can make herd control easier and may reduce production losses. Work with your vet on a parasite-control plan that fits your cattle type, region, and management system, and always follow label directions and withdrawal guidance for any product used in food animals.