Studies on the Neural and Hormonal Control of Horse Apocrine Glands
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Reviewing literature and data concerning sweating in equines, we postulated the following hypothesis. Epinephrine in mares is a calorigenic compound that increases body temperature through its role in glycogenolysis via the subsequent metabolization of the glucose made available by this glycogenolytic pathway. When body temperature exceeds that of the normal physiological range (due to increases metabolism and concomitant O2 consumption) then stimulation of a neural pathway leads to the compensatory phenomena of sweating. Shivering occurs when the body over-compensates for heat production through sweating in epinephrine mares, but such a homeostatic response is somehow blocked by PGF2a in the PGF2a injected mares. This view of sweating stimulation opposes Evans' and Smith's conjecture of hormonal stimulation of equine apocrine glands via epinephrine, but is consistent with the findings and data of both Evans and Smith (1953) and Robertshaw and Taylor (1968), with further support from the work of Aoki et a1 (1959) and Bell and Montagna (1972).