Large round produce large numbers of eggs which tend to stick around the anal area of the horse, as well as to objects in the horse s environment. In favourable climates, where conditions are cool and moist, pasture contamination can increase steadily however, heat and dryness can reduce larvae numbers. A horse becomes worm-infested by ingesting infective larvae. Often the infective larvae move away from the manure to nearby pasture, ready to be eaten by a horse.
Eggs and larvae can survive for considerable periods in cool weather with adequate moisture. In warm, moist conditions development is rapid, whereas in cool, dry conditions development is slower. The speed at which these worm eggs develop into infective larvae is dependent upon temperature and moisture. These eggs hatch and develop within the manure into immature known as infective larvae. Large and small red produce eggs which are passed in the manure.
There are a number of that infest horses the most important are large red (also known as large strongyles), small red (also known as small strongyles or cyathostomes), thread and large round. Signs of : poor growth weight loss tail rubbing scouring coughing in young foals colic death. 1 FEBRUARY 2010 PRIMEFACT 976 Worm control in horses Sarah Robinson Veterinary Officer, Animal and Plant Biosecurity, Wagga Wagga Signs of worm infestation in horses can be extremely variable, ranging from a barely detectable reduction in growth or performance through to a severe disease, colic, and sometimes death.
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