Seven tips from the Sheep Parasite Team on parasite control and sustainable anthelmintic drug use
1. Monitor your flock’s parasite load periodically
Monitor your flock’s parasite load periodically using fecal egg counts. Some animals may not show signs of parasite infection even with a heavy parasite load and can be a source of pasture contamination. Moreover, the type and load of parasites may change during the year and from one year to the other.
2. Test the effectiveness of anthelmintic dosing
Test the effectiveness of anthelmintic dosing by performing fecal egg counts before and after treatment. To be representative, fecal samples for 15 to 20 ewes are necessary. Collect feces from each ewe in individual bags, send them to the lab where they can pool samples in order to save cost.
3. Selectively treat animals
Selectively treat animals to decrease the rate at which resistance appears. Only treat animals with clinical signs (e.g., poor growth or condition) or other evidence of need (e.g., high FAMACHA score).
4. Always quarantine the new animals
Always quarantine the new animals introduced to the flock. Besides monitoring for other health issues, keep off pastures until treated with an appropriate anthelmintic combination and and have its effectiveness tested using fecal egg counts. Consult your veterinarian for details recommendations.
5. Use pasture management
Use pasture management to maximize parasite control and productivity whilst minimizing anthelmintic use.
6. Remember that roundworms comprise many different species
Remember roundworms (nematodes) comprise many different species which vary in their clinical and production impact and their sensitivity to different drugs. This needs to be considered in a parasite management program.
7. Remember to consult your veterinarian
Remember to consult your veterinarian to develop an effective and sustainable parasite control program for your flock.
