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Circadian changes in physiological responses and blood ionized sodium and potassium concentrations under thermal exposure in Tharparkar and Karan Fries heifers

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Title Circadian changes in physiological responses and blood ionized sodium and potassium concentrations under thermal exposure in Tharparkar and Karan Fries heifers
Not Available
 
Creator Dipak Banerjee and Ashutosh
 
Subject circadian rhythms; physiological responses; blood sodium; blood potassium; Tharparkar; Karan Fries; thermal exposure
 
Description Not Available
To explore the circadian changes in physiological responses and blood ionized
sodium, potassium concentrations under thermal exposure in Tharparkar (TP)
and Karan Fries (KF) heifers, 12 animals, six each from two breeds were taken
and kept first in control thermoneutral (21–268C and 50–60% RH) and in heat
exposed (388C and 50–60% RH) conditions thereafter. Throughout a 24-hour
period physiological responses (rectal temperature, respiration rate and pulse
rate) and blood samples were taken at 4-hour intervals, then blood samples were
analyzed for sodium (Na+) and potassium (K+) levels. Significant circadian
variations in physiological responses and blood Na+ and K+ within 24 hours have
been observed. Significant (P 5 0.01) variation in physiological responses and
blood Na+, K+ concentrations were observed in both Tharparkar and Karan
Fries heifers under control and heat exposed conditions. Values of physiological
responses were lower in the morning and showed an increasing trend and reached
the highest value in the afternoon. Blood Na+ and K+ concentrations decreased
from 11.00 hours to 19.00 hours due to heat exposure. The decreases in blood
electrolyte levels were greater in Karan Fries in comparison to Tharparkar heifers
that expressed less heat tolerance capacity in crossbred than indigenous cattle.
This finding suggests that it is important to standardize the time of sample
collection in comparative studies, in which more discrete differences may be
identified in physiological responses and blood electrolyte concentrations
Not Available
 
Date 2021-07-31T09:19:18Z
2021-07-31T09:19:18Z
1001-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/51648
 
Language English
 
Relation Not Available;
 
Publisher Not Available