Traditionally worming or drenching in horses has been performed regularly, approximately every two to three months, with rotational wormers. However, this regime contributes to the problem of worm resistance to anthelmintics (wormers or drenches). Not only that, it fails to take account of the fact that approximately 20% of horses are "high shedders" who shed approximately 80% of the worms whilst the remaining 80% of horses are "low shedders" who may only need to be wormed a couple of times a year. The gold standard is to actually test the worms that are present in equine faeces and in what numbers. Bundanoon Veterinary Hospital provides in-house faecal egg counts for clients to enable them to understand which horses in their paddock are high shedders and which are low shedders as well as to be able to understand the effectiveness of their worm reduction program over time. Alternatively samples can be sent on to the Department of Primary Industries who can also perform a simple egg count to assess worm burden and who can, in addition, culture the worm larvae and to tell you exactly which worms are present in the faeces. This test will differentiate, for example, between large and small strongyles (which cannot be differentiated on an in-house faecal egg count alone). Large strongyles, whilst far less prevalent, are implicated in some life threatening conditions such as colics/ intestinal obstructions.
Bundanoon Veterinary Hospital also stocks wormers at cost effective prices and can give appropriate advice on which worming products to use and when.