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Strobiloestrus sp. larvae in Merino sheep.

V Brain, H E van der Merwe, I G Horak

Journal of the South African Veterinary Association

|September 1, 1983

Summary

Strobiloestrus sp. larvae infested Merino sheep in South Africa, causing cutaneous nodules. The sheep likely contracted the parasite from mountain reedbuck, though the parasite

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Area of Science:

Veterinary parasitology
Zoology
Sheep and wildlife health

Background:

Cutaneous parasitic infections in livestock can impact animal welfare and productivity.
The genus Strobiloestrus is known to affect various African ungulates.

Purpose of the Study:

To document the occurrence of Strobiloestrus sp. larvae in Merino sheep.
To investigate the potential role of sheep and associated wildlife in the parasite's life cycle.

Main Methods:

Field observation and sample collection from Merino sheep in the Orange Free State.
Identification of parasitic larvae within cutaneous nodules.

Main Results:

Seventeen Merino sheep exhibited Strobiloestrus sp. larvae in cutaneous nodules on their flanks and rumps.
Larvae appeared unable to complete their life cycle in sheep, exiting nodules prematurely.
Mountain reedbuck, cohabiting with the sheep, were also infested and identified as a probable infestation source.

Conclusions:

Merino sheep can act as hosts for Strobiloestrus sp. larvae, but are likely not a definitive host for completing the parasite's life cycle.
Wildlife, specifically mountain reedbuck, play a crucial role in the epidemiology of Strobiloestrus sp. infestations in this region.

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