![]() They are only found on pasture, as they do not survive well on stable bedding. Here the larvae remain for around 10-12 months, feeding off the contents of the horse’s gut and maturing until spring or early summer when they will detach from their surface to be passed out in the host faeces. The common bot attaches to the top part of the stomach, the throat bot to the small intestine around the duodenum and the nose bot to the mucous membranes of the stomach or rectum. Eggs of these larvae hatch and crawl into the mouth within a few days to burrow into the gums and beneath the tongue.īot eggs on the horse's coat Larval Stageįor all bot species these tiny motile larvae stay in the mouth for three – four weeks before emerging to make their way slowly down to the gastro intestinal tract to burrow into the gut wall. haemorrhoidalis (the nose bot) which lays black eggs on the hair around the horse’s lips. nasalis (the throat bot) which lays yellow eggs around the chin and throat under the jaw area of the horse’s face and G. These eggs are ingested into the horse’s mouth as it rubs itself, the moisture and warmth of the mouth prompting the eggs to hatch a pinhead-sized larvae in about a week which burrows into the gums, or beneath the tongue. intestinalis (the common bot) lays pale yellow eggs on the hair of the body, most usually the shoulders and forelegs. The three main species that affect UK horses can be differentiated by where they lay their eggs on the horse: G. Pictured above: bot fly larvae passed in horse poo. Their development involves four distinct stages -egg, larva, pupa, and adult fly, only the latter living independently from their equine host. ![]() Bots ( Gasterophilus spp.) aren't horse worms but rather flying insects, a bit like a scrawny wasp, whose life cycle is inextricably linked with the horse.
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