Originally Posted by usandpets
We just went to a seminar on deworming. It is now recommended to NOT do a regular schedule deforming and not to rotate dewormers.
You should have fecal counts done on each horse. The ones with higher counts would get dewormed but not the lower ones.
Regular dosing and alternating causes a resistance by the worms to dewormer. Leaving the lower count horse untreated lessens the resistance.
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The daily dosing method using the same active ingredient has been shown to encourage worms to develop a resistance to it but as far as I've read on recent research publications changing the active ingredient is the best way to reduce resistance and not what causes it?
I do have them done but the fecal egg counts don't show up tapeworm or encysted worms - a blood test can confirm those and the latter are one of the most common causes of stomach ulcerations, anemia and severe weight loss in horses