Effects of Long-term Heat Exposure on Adaptive Mechanism of Blood Acid-base in Buffalo Calves

Autor:	D. C. Shukla, V. P. Varshney, J. P. Korde, G. Singh
Rok vydání:	2007
Předmět:	medicine.medical_specialty Fractional excretion of sodium Respiratory rate Chemistry Potassium chemistry.chemical_element medicine.disease Excretion Urine flow rate Endocrinology Respiratory alkalosis Internal medicine Extracellular fluid medicine Animal Science and Zoology Base excess Food Science
Zdroj:	Asian-Australasian Journal of Animal Sciences. 20:742-747
ISSN:	1976-5517 1011-2367
Popis:	In order to investigate the mechanism of adaptation to long-term heat stress, six female buffalo calves of about 7 to 8 months age, were exposed to the cool-comfort environment (THI 65) for 21 days to obtain normal values of blood acid-base. An adaptive response of acid-base regulation was determined to long term (21 days) exposure of buffalo calves to hot-dry (THI 80) and hot-humid (THI 84) conditions. Higher rectal temperature and respiratory rate was recorded under hot-humid exposure compared to hot-dry. Significant reduction in the rectal temperature and respiratory rate on day 21 of hot-dry exposure indicated early thermal adaptation compared to hot-humid. Decreasing rectal temperature and respiratory rate from day 1 to 21 was associated with concurrent decrease in blood pH and pCO 2 . Increased plasma chloride concentration with low base excess in blood and in extracellular fluid suggested compensatory response to respiratory alkalosis. Reduced fractional excretion of sodium with increased fractional excretion of potassium and urine flow rate indicated renal adaptive response to heat stress.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2d6d0851d44c96c3cc06c08e9cab6b60 https://doi.org/10.5713/ajas.2007.742 Zobrazit plný text záznamu