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Strobiloestrus sp. larvae in cattle

I G Horak, J Boomker

Journal of the South African Veterinary Association

|September 1, 1981

Summary

Cattle in the Transvaal were infested with Strobiloestrus sp. larvae. A pour-on insecticide effectively treated the parasitic infection in these livestock.

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Area of Science:

Veterinary Entomology
Parasitology
Livestock Health

Background:

Strobiloestrus sp. larvae were identified in nodules on cattle in the Middelburg District, Transvaal.
Larval development from the second to third stage occurred within 25 days in observed cases.

Purpose of the Study:

To investigate the circumstances leading to Strobiloestrus sp. infestation in cattle.
To evaluate the efficacy of an insecticide treatment against Strobiloestrus sp. larvae.

Main Methods:

Field observation of infested cattle over a 25-day period.
Assessment of environmental and host-related factors contributing to infestation.
Application and evaluation of a pour-on insecticide formulation.

Main Results:

Cattle, including calves and a heifer, were found with Strobiloestrus sp. larvae in subcutaneous nodules.
Factors such as the presence of klipspringers (normal hosts), grazing patterns, calf hair color, and tick control likely contributed to cattle infestation.
A pour-on insecticide formulation demonstrated high efficacy in eliminating the larvae.

Conclusions:

The study identified a probable transmission pathway for Strobiloestrus sp. to cattle.
Effective control of Strobiloestrus sp. infestation in cattle can be achieved with pour-on insecticide treatments.

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