November 2020 in “Journal of animal science/Journal of animal science ... and ASAS reference compendium” Certain genetic variants in PRLR and PCCA genes may lead to shorter hair in cattle, which could help with heat tolerance.
Acidic sandy clay damages archaeological hair the most, while dry conditions preserve but make it brittle; silicone oil can help keep the hair flexible.
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July 1958 in “Journal of Endocrinology” Cortisone suppresses hair regrowth, especially undercoat hair, while adrenalectomy affects hair growth differently in rabbits and rats.
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November 2015 in “JAMA dermatology” A 91-year-old woman's hair turned black in one spot, with skin changes underneath.
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June 2020 in “Animal genetics” Scientists found genes linked to hair length in Brangus cattle that could help breed heat-tolerant cattle.