Sheep ked

The sheep ked (Melophagus ovinus) is a wingless, blood-sucking fly belonging to the family Hippoboscidae. It is a specialized ectoparasite that spends its entire life cycle on the host.

Adult keds are brownish in color, measuring about 4 to 7 mm in length, and their bodies are covered in coarse, stiff hairs. They lack wings but possess strong, hooked legs for gripping the wool.

Unlike many other flies, the sheep ked is viviparous. The female gives birth to a single larva that immediately glues itself to the host's hair and rapidly transforms into a pupa.

The development from pupa to adult is highly dependent on the host's body heat and the density of the fleece, which provides an ideal environment for the parasite's survival.

Because they spend their entire life on the sheep, they are extremely adapted to their host and are rarely found on other animal species in the same environment.

Sheep keds feed exclusively on the blood of sheep and goats, causing significant irritation and physical stress to the animals. This leads to a marked decrease in overall flock health.

The persistent itching causes sheep to rub against fences and walls, resulting in significant wool damage. This "tagging" and fraying of the fleece reduce its commercial value.

Heavy infestations can lead to anemia, particularly in lambs and weak adults. The constant blood loss and stress prevent the animals from maintaining proper weight and body condition.

The parasites leave behind waste products and stains on the wool, which further lowers its quality. This makes the wool difficult to process and significantly reduces the farm's profit.

Secondary infections often arise in the skin lesions caused by the ked's bites, requiring additional medical intervention and reducing the general productivity of the herd.

The most common sign of infestation is excessive scratching and rubbing by the sheep. You will notice broken, matted, and discolored patches of wool across the animal's body.

Upon closer examination, you can find the adult keds moving quickly through the wool, especially around the neck, breast, flanks, and belly where the fleece is thickest.

The pupae appear as small, hard, dark brown, barrel-shaped capsules fixed to the wool fibers. These are often the most visible evidence of a long-standing ked infestation.

Poor growth rates and a general lack of thriftiness in the flock, despite adequate nutrition, often indicate a high parasite load affecting the animals' metabolism.

• Persistent scratching and restlessness in the flock.
• Matted, ragged, or thin areas of wool.
• Visible presence of adult brownish flies.
• Dark, capsule-like pupae attached to the wool.
• Reduced weight gain and anemia in young lambs.

Shearing is one of the most effective mechanical methods for controlling sheep keds, as it removes a large number of adults and pupae attached to the wool fibers.

Chemical control involving insecticides, such as dips, pour-on treatments, or sprays, is necessary to eradicate the parasite population from the flock effectively.

Maintaining high standards of hygiene in sheep housing is crucial. Thorough cleaning helps to reduce the number of parasites surviving in the environment between host animals.

Quarantine new additions to the herd before they join the main flock to prevent the introduction of keds into clean areas, as the parasite spreads through direct contact.

A coordinated management strategy, where all animals in the flock are treated simultaneously, is required to prevent re-infestation and ensure long-term control.