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Animal welfare: Potential new indicator of chronic stress in horses

Cortisol, deemed the quintessential stress hormone, allows us to cope with important events and imminent threats. A spike in cortisol levels mobilizes necessary resources--such as by tapping into our body's reserves to produce energy--and then allows us to return to a stable state. But can our bodies cope with prolonged or repeated stress in the same way? Some studies report lower cortisol levels in humans--or other mammals--subject to chronic stress, while other studies contradict these findings.
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