10-13-2011, 04:43 PM
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A tapeworm consists of a head with a segmented body, each segment independantly able to produce eggs.
The head attaches to the horse's gut and sucks nutrients, the segments mature. The most mature ones are at the end. When mature, the segment detaches and is passed out in fecal matter.
Next stage, mites in the ground eat the eggs, and these mites, in turn, crawl on the grass and are injested by the horse when he grazes, starting the cycle all over again.
I don't think the mites can live in the frozen ground, so the cycle breaks a bit over the winter. Thus, worming for tapeworms after the first hard frost can help get rid of most of the tapeworms inside ole dobbin.