Routine worming of horses is a part of every horse owner’s annual calendar. However as reports of growing resistance within parasite groups increases a more responsible approach is now recommended.
During the summer months faecal egg counts can be performed to identify those individual adult horses which need treatment. However it is always recommended to give a treatment for encysted redworm in late autumn-early winter as these larvae which hide in the wall of the gut presently cannot be detected with tests. For more information on the dangers of encysted redworm watch the video below.
Only a single dose of moxidectin or 5 days of fendendazole treatments kill encysted redworm. As there is widespread resistance to fenbendazole in this species of worms, moxidectin is generally the treatment of choice. If a product is used which combines moxidectin with praziquantel the horse will also be treated for tapeworm.
Ask your vet for more information about the responsible use of worming treatments.