Studies show zebra stripes might work as a fly deterrent.
Of course everyone is fully aware of what zedonks, zorses, zonkeys, and zebroids are …
According to Blahó et al., authors of “Stripes disrupt odor attractiveness to biting horseflies: battle between ammonia, CO₂, and color pattern for dominance in the sensory systems of host-seeking tabanids,” published in the July 2013 edition of the journal Physiology & Behavior, flying insects such as flies and mosquitoes use visual cues to help find their next meal. Apparently, such flying insects find zebras have “reduced optical attractiveness” compared to solid colored animals. The study authors concluded, “This result demonstrates the visual protection of striped coat patterns against attacks from blood-sucking dipterans, such as horseflies, known to transmit lethal diseases to ungulates.”
But painting every horse in your herd every day is likely not feasible, so I have to ask: Why not try zebra flysheets?