Over the past 12 years or so I average about 2 de wormings a year on non bred horses. Testing is the only way to really know what your horse needs with one exception which is Ivermectin which should be done 2 times a year and timing on this is very importent. If you do not get the timing correct the horse will just get re infested with in a week or so.
Rotating is always good however de worming every 8 weeks when not needed is leading to resistence issues and it is a growing problem.
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