Turnover and oxidation rates of blood glucose and heat production in sheep exposed to heat

Journal of Dairy Science
H SanoT Tsuda

Abstract

Five shorn sheep were used to study effects of heat exposure (30 degrees C, relative humidity 70%) on metabolism of blood glucose and heat production. The isotope dilution method was applied for determination of metabolism of blood glucose in a thermoneutral environment (20 degrees C, relative humidity 70%) and on the 4th and 10th days of heat exposure. Concentrations of free fatty acids and thyroxine of plasma decreased during heat exposure with no reduction in feed intake. At 20 degrees C, glucose turnover rate, percentage of glucose oxidized, and contribution of exhaled carbon dioxide derived from glucose to the total carbon dioxide production were 6.2 mg/kg.75 per min, 34%, and 11%. Glucose turnover rate decreased significantly during heat exposure, but the proportion of glucose oxidized was unchanged. Heat production decreased almost parallel to the glucose turnover rate during heat exposure, resulting in an unchanged contribution of carbon dioxide derived from glucose to the total production of carbon dioxide. Blood glucose metabolism and heat production of sheep decrease, but the contribution of blood glucose to heat production remains unchanged during exposure to 30 degrees C.

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Citations

Jul 1, 2010·Animal : an International Journal of Animal Bioscience·U BernabucciA Nardone
Jan 1, 2013·Annual Review of Animal Biosciences·Lance H Baumgard, Robert P Rhoads
Jan 9, 2015·Journal of Animal Science·J S JohnsonL H Baumgard
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May 16, 2013·Advances in Nutrition·Robert P RhoadsSara R Sanders
May 28, 2016·Animal Science Journal = Nihon Chikusan Gakkaihō·Amani Al-Dawood
Feb 5, 2014·Journal of Animal Science·E MahjoubiL H Baumgard
Jan 17, 2017·Animal : an International Journal of Animal Bioscience·M Al-MamunH Sano
Dec 3, 2016·International Journal of Biometeorology·Li MinJiaqi Wang
Sep 27, 2018·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Lidan ZhaoRobert P Rhoads
Mar 7, 2013·Journal of Animal Science·S C PearceL H Baumgard
Aug 4, 2012·Journal of Animal Science·H M WhiteS S Donkin

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