How long does sprayed grass take to give a horse colic?

Sprayed grass can potentially cause colic in horses if it contains harmful chemicals or if the horse consumes it in large quantities. The onset of colic symptoms can vary, but signs may appear within hours to a few days after ingestion, depending on the specific substances involved and the horse's sensitivity. It's essential to ensure that any grass or forage sprayed with chemicals is safe and to follow recommended waiting periods before allowing horses to graze. Always consult with a veterinarian if you suspect your horse may be affected.