Sweat gland function of the donkey (<i>Equus asinus</i>)

Robertshaw, David; Taylor, Curtis R.

doi:10.1113/jphysiol.1969.sp008952

Cited by 46 publications

(42 citation statements)

References 14 publications

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“…In cattle, regular discharges similar to those seen in sheep occur, but they are superimposed on a continuous output of secretion (McLean, 1963). In the horse and donkey, the output of sweat is also continuous but such fluctuations as occur are less obviously synchronous and are of variable form (Allen & Bligh, 1969;Robertshaw & Taylor, 1969).…”

mentioning

confidence: 92%

Sweat gland function in isolated perfused skin.

Johnson¹

1975

The Journal of Physiology

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SUMMARY1. A technique for perfusion of skin has been used to investigate a possible neurochemical basis for the different patterns of sweating in domestic animals. Evaporative water loss was measured from excised trunk skin, ears or tails perfused with a nutrient Krebs solution, to which drugs were added as required. Perfused skin was observed to sweat in response to administration of sudorific drugs, and some features of the patterns of sweating were similar to those which could be induced by heating or by drugs in conscious animals.2. In sheep and goat skin, injections of adrenaline, and to a lesser extent of noradrenaline, elicited brief sweat discharges but these were not sustained when the drugs were infused during 10-20 min. Injections of isoprenaline, carbachol, 5-HT, bradykinin, oxytocin and histamine were all ineffective.3. Injections of adrenaline into cattle skin evoked longer-lasting sweat discharges, and infusions of adrenaline elicited continuous discharges. Injections of noradrenaline and sometimes of bradykinin caused only brief sweat discharges; other drugs were ineffective.4. In horse and donkey skin, injections or infusions of noradrenaline, oxytocin and bradykinin elicited brief discharges of sweat. Infusions of isoprenaline caused a continuous and profuse outflow of sweat. Infusions of adrenaline also caused a continuous discharge which was usually biphasic in its onset. Other drugs were ineffective.5. Assuming that the brief sweat discharges are due to myoepithelial contractions and the continuous discharges to sustained increases in secretion, equine sweat glands seem to have an ac-adrenergically controlled myoepithelium and a fi-adrenergically controlled secretary mechanism.Sheep and goats may have a similar ac-adrenergic control of the sweat gland * Present address:

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confidence: 92%

Sweat gland function in isolated perfused skin.

Johnson¹

1975

The Journal of Physiology

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“…). Studies in donkeys have demonstrated that the main component of equid sweat control is neural with the humoral component becoming active during exercise (Robertshaw and Taylor ). Stimulation of sweating in other species can be achieved by cholinergic stimulation, as well as adrenergic stimulation; however, equine sweat glands are insensitive to carbamylcholine and are controlled only by adrenergic neurotransmitters, such as adrenaline and noradrenaline (Johnson and Creed ).…”

Section: Discussionmentioning

confidence: 99%

Atypical histopathological findings in a 15‐year‐old Warmblood gelding diagnosed with anhidrosis in a temperate climate

Sullivan

Cudmore

Bacci

et al. 2014

Equine Veterinary Education

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Summary This case report describes the atypical histopathological findings in a horse with anhidrosis that presented for evaluation of suspected respiratory disease during autumn/winter in a temperate climate. Anhidrosis in this horse was associated with mononuclear infiltration of T lymphocytes around sweat glands, a finding not previously reported in cases of equine anhidrosis. This report highlights the importance of considering anhidrosis as a differential diagnosis in the investigation of respiratory disease and illustrates that the condition can occur in horses residing in temperate climates.

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“…The r e c e p t o r s , however, are of the beta variety (D. Robertshaw, unpublished observations). Under conditions of e x e r c i s e there may also be a humoral component of a d r e n o -m e d u l l a r y origin (Robertshaw and Taylor, 1969b). PROSIMINIAN PRIMATES.…”

Section: Jmentioning

confidence: 98%