In Yamagata prefecture, Japanese Black cattle, known for their prized wagyu beef, are undergoing a unique treatment involving the application of vertical stripes using mild bleach or spray paint. This unconventional practice has emerged from three years of research, which demonstrated that striped cattle experience significantly fewer issues with flies, thereby reducing stress levels and discomfort. Historically, farmers have grappled with bloodsucking insects affecting their herds’ reproductive rates. By adopting the use of stripes, farmers hope to alleviate these concerns and promote the overall health and relaxation of their cattle. Observations have shown that striped cattle exhibit fewer signs of irritation compared to their unpainted counterparts, indicating a potential deterrent effect on flies. While the scientific mechanism behind this phenomenon remains unclear, researchers are actively disseminating their findings to farmers throughout the prefecture. Consequently, farmers have reported tangible improvements in their herds’ well-being and are embracing this innovative solution to combat insect-related challenges.