here - Australian College of Veterinary Scientists

much higher and corresponded to the much taller sow grass. The owner reported
that the horse refused to pass through patched of this grass when it was "seeding"
and if forced to would stomp its feet and chew at the limbs where the grass had
touched the skin. Washing the limbs down and isolating the horse off the paddock
with this grass and broad leaf paspalum resulted in signs resolving.
Thus it would seem that these horses had contact allergy to these pasture plants and
that the other insect reactions and pollens to which it was positive on intradermal
skin test were not related to the skin lesions, as the horses would have still been
exposed to these environmental allergens while yarded adjacent to the grazing
paddocks. The paddock plants suspected to be the cause due to positive allergy
tested with a crude saline extract were only allergic when pollen and seed heads were
developed in summer and autumn.
ACVSC Proceedings Dermatology Chapter Science Week 2005 37