Atlas of livestock parasites
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Linognathus vituli



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Linognathus vituli
Long-nosed or blue cattle louse

General Description:
Wingless insect, 2.5 mm in length, with a long narrow head and slender body. The mouth parts are adapted for sucking. These lice are blue in color due to blood seen through the yellowish-brown body wall.

Life Cycle:
Typical life cycle of lice takes 1 month.

Most often found on protected areas of skin: side of neck, brisket, back, head, and between the legs.

Geographical Distribution:

Widely distributed throughout the world.

This is a common parasite of cattle which can cause serious damage if present in large numbers.

Effects on Host:
Louse worry is great, causing cattle to lick, scratch, and rub affected areas. This causes the coat to become rough. Anemia may arise if infestation is heavy. Anemia leads to debilitation which makes animals susceptible to infectious diseases and extremes in environmental temperature.

Diagnostic Information:
Lice may be seen on skin.


Insecticides are effective in various preparations.


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