Answer: While it is unlikely a horse will become ill or suffer harmful effects from being dewormed too often, in the long term, all horses’ health can be compromised by the development of parasite resistance to dewormers. … Thus, it doesn’t make sense to treat every horse with the same eight-week frequency.
These guidelines recommend that if regular deworming is used, animals should be treated at least 4 times a year, with no more than 3 months between each treatment. This is based on some research indicating that dropping treatment to 3-4 times per year had no effect on parasite levels.
Common signs of parasite or worm infection include:
Ivermectin and moxidectin are the best choices to control strongyle parasites. Pyrantel, fenbendazole and oxibendazole are good for treating ascarids in young horses. Ivermectin resistance is common in ascarids.
Many of the data sheets for wormers, notably those that contain praziquantel, ivermectin or moxidectin, advise stabling for two – three days after worming. Equitape data sheet states that “in order to limit pasture excretion of the product and its metabolites, horses should remain stabled for two days after treatment”.
Regular worm egg counts are necessary during the grazing season, which can be between March and September (weather dependent). Horses with single high worm egg counts, regular elevated counts or susceptible horses (very young or old) do then need treating.
Each horse should be dewormed every 6 months with an Ivermectin product (Spring and Fall). Ivermectin is a larvicidal (will kill parasite larvae), and if used every 6 months on each horse, large strongyles will be eliminated from your farm.
Mebendazole does not kill the eggs of the worm. This is why you may need to take another dose 2 weeks later to help prevent reinfection. How long does it take to work? The medicine should start to work straight away but it may take several days to kill all the worms.
Here are the best dog dewormers you can buy:
Occasionally you might see the parasites themselves in the droppings. Even if your horse has worms this is rare because they are usually metabolised in the gut first but it’s definitely not unheard of. If you see worms you will want to identify and treat them with the appropriate wormer.
Because these worms can migrate to the lungs, infected horses may show signs of respiratory disease such as cough or nasal discharge.
Internal parasites, such as worms, compete with the horses’ body for nutrients and often result in weight loss. Parasites may become resistant to many of the common de-wormers, so it is important for your vet to check the faeces for parasite eggs to rule out this problem.3 мая 2019 г.
“(Non moxidectin, Non fenbendazole product) has the capacity to treat all common types of parasitic worms (including tapeworms) and bots.” “(Non moxidectin, Non fenbendazole product) has the best combined efficacy and the broadest spectrum of activity of any wormer.”
If you do not ACCURATELY know your horse or pony’s weight then by overdosing you will be speeding up the development of worm resistance and by under dosing you will be wasting your money on wormers as your horse or pony may still be suffering from worm infestation and damage.