We are encountering quite a few horses that have large worm burdens lately. With the reduced feed about this increases the grazing pressure and horses will graze closer to contaminated faeces. The article Worming Horses provides some handy hints on worming including strategies to minimise drench resistance. It is important to note that rotating drenches should be done on a yearly basis and should be rotation between a ‘mectin’ class and a ‘BZ’ class.
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