Identifying potential thermal drivers of sudomotor in camels (Camelus dromedarius)
, 1. Samara EM, Abdoun KA, Okab AB, Al-Badwi MA, Al-Haidary AA . 2019
The mechanism of sudomotor regulation in the family Camelidae, as in other mammals, is poorly understood. Five
healthy dromedary bulls (400 kg and 4 years-old) were used to examine the interrelationship of sweating rate (SR)
with ten thermal parameters measured (and/or estimated) every 3-hr for a 24-hr time period under natural and
shaded environmental conditions, in order to subsequently identify the potential thermal drivers of sudomotor in
this species. Results revealed that all parameters, including SR, had clearly (P < 0·001) exhibited monophasic
circadian rhythms. Moreover, the obtained findings pointed out that strong/moderate positive correlations were
existed between SR and eight parameters [i.e. ambient (Ta), rectal (Tr), body (Tb), skin (Tsk), coat (Tct) temperatures
as well as total (ambient-to-body, BTGt), external (ambient-to-skin, BTGex), and internal (skin-to-body, BTGin)
body thermal gradients] suggesting that they may all be good indicators of sweating activity. Nonetheless, out of
those highly-correlated parameters, merely six (i.e. Ta, Tb, Tsk, Tct, BTGt, and BTGex) showed superior coefficients of
determination (R2≥0·90; P < 0·000) when interrelated with SR; thereby, implying that they have the potential to
drive sudomotor. Notably, however, results were more probably allude that sudomotor iregulated through BTGt.
Accordingly, the onset of sweating (i.e. threshold) and its effective level was determined using BTGt. A method of
how SR can be regulated through BTGt was proposed according to Webb’s theory of controlling body-heat content.
Some shortcomings prevent confirming that BTGt is the best thermal driver of sudomotor in this species were
noted. Research dealing with this interesting physiological process requires further experimentation to fully elucidate
the basic functional mechanisms of Camelidae's thermoregulatory system .
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