PMID: 696851Sep 1, 1978Paper

Hypothalamic thermosensitivity in conscious Pekin ducks

The American Journal of Physiology
C Simon-OppermannH T Hammel

Abstract

Conscious Pekin ducks with chronically implanted hypothalamic thermodes were submitted to thermoneutral (Ta 25 degrees C), cold (Ta 5 degrees C), and warm (Ta 33 degrees C) ambient temperatures. Hypothalamic temperature (Thy) was varied in nine steps between 27.9 and 43.5 degrees C in repeated experiments. Cooling of the hypothalamus induced a fall of core temperature (Tc) that was linearly related to Thy and amounted to 1.1--1.3 degrees C at highest cooling intensity. The decrease of Tc was caused by inhibition of metabolic heat production and/or vasodilatation in the skin at cold and thermoneutral Ta and by activation of panting at warm Ta. After the end of cooling a temporary overshoot of heat production occurred, the degree of which depended on the degree of cooling and on Ta, and led to a rapid normalization of Tc. Warming of the hypothalamus induced a slight fall of Tc due to a reduction of metabolic heat production at cold and thermoneutral Ta and to an activation of panting at warm Ta. It is concluded that no specific cold reception and a weak specific warm reception exist in the duck's hypothalamus. A "nonsensory" temperature susceptibility of hypothalamic control functions is responsible for those reactions of thermor...Continue Reading

Citations

Aug 22, 2008·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Manette Marais, David A Gray
Jun 17, 2011·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Manette MaraisDavid A Gray
Mar 14, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·David A GrayPeter R Kamerman
Nov 20, 2012·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·David A GrayShane K Maloney
Jan 31, 1978·Pflügers Archiv : European journal of physiology·S Puschmann, C Jessen

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