Animals with dark hides are at a higher risk of suffering heat stress and dying. Deaths of black-hided cattle on pasture without shade and limited supplies of water have been recorded. Body core temperature research has shown that in a cohort of cattle that were genetically closely related but phenotypically had different hide colors, cattle with dark hides had a 2 F higher core body temperature than their cohorts with lighter-colored hide.
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Provide shade if possible. Solar radiation from sunny, clear skies contributes to body temperature in cattle. Black-hided cattle in the same pens with white-hided cattle will have internal body temperatures several degrees hotter than the white-hided cattle. Providing shade stops solar radiation from increasing body temperature. Although this may not be practical for all cattle in a feed yard, identify susceptible pens and be ready to intervene proactively with all measures possible.
Consider turning cattle out temporarily under trees for shade. The decrease in feed efficiency or loss of weight is minimal, considering the potential cost of losing cattle due to heat stress.