Anti-parasite remedies should be changed every two years to prevent resistance from forming.
In young lambs internal parasites such as milk tapeworm (Moniezia expansa) can prove problematic, while adults can fall victim to wireworm (Haemonchus contortus).
The wireworms are bloodsuckers that can cause death due to anaemia from severe internal blood loss. Animals that carry heavy worm loads can furthermore develop immunity disorders, making them helpless to opportunistic diseases.
If animals are left untreated for lengthy periods they can become ‘reservoirs’ for parasites, and will keep on reinfecting animals that are healthy on communal rangelands.
Parasite-infested animals become unproductive and give birth to weak offspring; they also struggle to feed their young. Low-quality wool may be produced by wool sheep.
Although some animals can develop some immunity against parasites and diseases and remain functional, others are continually affected. These animals should be culled.
Symptoms of worm infestation
Management protocols farmers should consider introducing
Treat all the village animals at the same time by using the same injectable treatments or doses. If even a few animals are left untreated, reinfection will be rapid, and dosing will need to be undertaken more often.
Source: Farmer’s Weekly