Commentary
Drought, slow pasture growth, moving cattle to new grass and cattle grouping around hay feeding areas increase exposure to the pinkeye bacteria flies readily transfer. Even if cattle are already turned out, consider pinkeye vaccination during movements to new pasture. Pinkeye in cattle most often involves both Moraxella bovis and Moraxella bovoculi. Vaccination for both organisms is essential for the strongest, season-long protection and providing healthy cattle to feed lots.
Source: FEEDLOT Magazine, Facebook, May 5, 2026. Link. Pinkeye severely impacts cattle performance because it causes intense pain, significant vision impairment, and reduced feed intake. Cattle will often seek shade, which will decrease their grazing time.
Economic losses associated with this condition are estimated at $150 million annually due to reductions in weight gain, decreases in milk production, treatment costs, and potential price discounts for affected animals.
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Source: Addison Biological Laboratory. <Link>
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