A model for the dynamics of the parasitic stages of equine cyathostomins.

•The parasitic life-cycle of equine cyathostomins is modelled, including.•Declining larval establishment and development, and adult fecundity, as horses age.•Negative feedback from adult worms in the lumen on larval development and survival.•A maximum life-span of one year for adult worms.•Model output suggests a previously unrecognized effect of larval intake on worm dynamics.