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I think with the infrequent use of wormer chances are your horses are not going to become resistant AA...
I equate it to humans and antibiotics use...
If I overused, in reality abused taking antibiotics to treat for issues they not work for and then not finish the course of the drug...sure could see a issue in my own body.
But I don't take antibiotics for viral only bacterial infections, when they are ordered by a physician after they determine it is bacterial and take the full course of drugs so the bacterial is destroyed, not left a little behind to mutate in my body.
I rarely need the heavy-duty stuff that makes me so ill feel I'm going to die taking it...

Growing up it was the practice to worm the horse every 3 months, no fecals fact not sure that word was ever mentioned to me or my parents who funded my horse as a teen.
No rotational was mentioned either...
In fact, paste worming medication was just emerging on the market so worming medication was administered by tubing the horse....we have come so far!
When paste began there were only 2 maybe 3 type/names on the market and know mine came from the vet actually and he wrote on the box what month to administer it...

I truly think when you use some thought to what you are doing, why and when along with what products you are presenting your issue of resistance is going to be a non-issue.
I don't do feed through daily as some do....don't find the need or reason to offer a, in-fact poison to my horse to be ingested daily to kill what may or more the chance is not present in their body. If that is someone's preference, more power to you and your diligence to keep your animal{s} healthy.

For myself, my horses are in a closed herd setting.
We have contact with only the neighbors horses and when I worm she also does so anything and everything is hopefully eradicated from all our animals at the same time.
Now, I do worm 2x a year normally.... once for the ridding of the horses from bot eggs and worms that come from the flies in over abundance we all deal with. And then to rid them of any tapeworm or similar since studies have found horses living east of the Mississippi River 60% of them are infected.... the number is higher for the midwest by the way and skyrockets for horses in other parts of the world.
So, yes I do worm for preventive measure not just because there is a known issue since not all worms show on fecals.
If my horses also suddenly look "off" to me...weight loss, rough coat, diarrhea and of course colic in which case that rectal exam is probably going to show evidence of the icks when the gloved arm is removed.. I treat.
What and how I and my neighbor do works for us and our closed herd.
Our horses are not exposed to other animals nor are they off grazing where other horses go at parks or show grounds...another reason my horses are not permitted to ground graze nor sniff poop of other horses forget nibble at it fresh! I know many not understand the value of no grazing at common areas but there it is....keeps mine healthier and once their hay hits the ground at a common area of horse gathering it is left their...not scooped up and taken home...don't do that!
If you keep a closed herd, keep a neater existence home and follow some simple precautions so much less chance of infection presents itself.
You could worm every month, but if you don't treat the animal{s} that is the carrier then you are just pushing a empty envelope in a circle never gaining better health for yours... braking the cycle is what it is about!

I don't think I would go to one time a year though worming AA.... the reasons for treating is more than just the seen as you say and for me personally has a lot to do with other environmental things like bots and the need to stop them and their cycle seen exterior and the damages interior they can do and neck threadworms which are not seen.
The fact you also have a youngsters in your herd also it is said the younger are more apt to carry and grow a worm-load issue and for Harley I think the added protection is worth the small expense and time factor involved administering.
Harley is also a reason to continue to truly protect as his immune system weakens with advancing age.

Regardless of what others do, do what has been working for you and don't chance or change it....
You're managed at the moment and truly do not want to have to play catch-up if a incident occurs it could be far-reaching in your horses future health interests.
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