scholarly journals Effect of heat stress on acid-base balance in Polish Merino sheep

2013 ◽  
Vol 56 (1) ◽  
pp. 917-923 ◽  
Author(s):  
K. Wojtas ◽  
P. Cwynar ◽  
R. Kolacz ◽  
R. Kupczynski
Keyword(s):  
Heat Stress ◽  
Cortisol Level ◽  
Environmental Parameters ◽  
Cortisol Secretion ◽  
Acid Base Balance ◽  
Acid Base ◽  
Merino Sheep ◽  
Air Movement ◽  
Partial Pressure Of Co2 ◽  
Base Balance

Abstract. Effect of heat stress on changes in acid-base balance, physiological parameters and cortisol level were evaluated in Polish Merino sheep. Fifteen sheep were exposed to high temperature conditions (30 °C) in order to induce heat stress. All environmental parameters such as temperature, humidity and air movement were monitored. A decrease of partial pressure of CO2 (pCO2) in blood and concentration of total CO2 (tCO2) and an increase of pO2 were observed. The cortisol level also significantly increased. In the next stage of the experiment the soothing effect of air movement was examined. An increased air movement led to reduction of thermal stress. An increase in pCO2 and decrease in cortisol level were observed. The study showed that heat stress leads to changes in acid base balance and cortisol secretion. Air movement has a soothing effect on heat stress in Polish Merino sheep.

The effect of heat stress on respiratory alkalosis, blood acid base balance and insulin sensitivity in cinnamon supplemented pigs

2017 ◽  
Vol 57 (12) ◽  
pp. 2415
Author(s):  
J. J. Cottrell ◽  
F. Liu ◽  
S. Wan ◽  
U. A. Wijesiriwardana ◽  
K. DiGiacomo ◽  
...  
Keyword(s):  
Heat Stress ◽  
Insulin Sensitivity ◽  
Respiratory Alkalosis ◽  
Acid Base Balance ◽  
Acid Base ◽  
Base Balance

scholarly journals Determination of NABE in urine of high-yield dairy cows in early lactation in conditions of moderate heat stress

2010 ◽  
Vol 64 (5-6) ◽  
pp. 349-358
Author(s):  
Natalija Fratric ◽  
Ivan Vujanac ◽  
Horea Samanc ◽  
Danijela Kirovski ◽  
Dragan Gvozdic ◽  
...  
Keyword(s):  
Heat Stress ◽  
Dairy Cows ◽  
High Yield ◽  
Early Lactation ◽  
Acid Base Balance ◽  
Acid Base ◽  
Urine Ph ◽  
Base Balance ◽  
Daily Milk Production

The work presents the results of investigations of the effect of moderate heat stress on the acidobasal status in high-yield dairy cows in early lactation. Improving performance in high-yield dairy cows increases their inclination toward metabolic disorders. The most likely to be affected is the acid-base balance, in particular when cows are exposed to heat stress. Investigations so far have shown that the taking of urine samples and their analysis is the best and fastest way to diagnose disorders in the acid-base balance. Investigations were carried out on 7 clinically healthy cows of the Holstein- Friesian breed in the phase of early lactation, 30 to 40 days (on days 30, 33 and 40 ) following calving during the summer period, during the month of July, when there were significant variations in daily and nightly temperatures. The cows were in the second and fourth lactation, the annual milk yield was 8000 L milk per cow. The average daily milk production in the early phase of lactation ranged from 35 to 40 L. The cows were fed mixed rations (TMR) twice daily. Lucerne hay in limited quantities was given to the cows prior to the mixed feed ration. The ration for this animal category was optimized on the grounds of the daily milk production. The balance of cations and anions in the feed ration stood at 95 mEq/kg DM. The results clearly demonstrate the cows' response to moderate heat stress through the defense parameters in urine (urine pH, NABE (net-acid-base-excretion), acids, bases, ammonium ion (NH4). The determination of the kidney NABE yields more correct data than the urine pH on acidotic conditions. The results of examinations of the urine pH do not show any digressions from physiological values and are approximately the same in all cows during the investigated periods. Normal NABE values are from 100-200 mmol/L. Burdening with acid products results in a NABE range from 0-100mmol/L, and metabolic acidosis results in NAB<0 mmol/L. NABE in the cows in this experiment revealed that the organism is burdened by acid metabolic products and it stood at 58.28?27.96 mmol/L on day 30, 69.28?29.89 mmol/L on day 33, and 60.60?26.88mmol/L on day 40. Consequently, it seems that NABE values are decreased in cases of acidosis due to stepped up H+ excretion and stepped up bicarbonate reabsorption.

scholarly journals Liver Transcriptome Responses to Heat Stress and Newcastle Disease Virus Infection in Genetically Distinct Chicken Inbred Lines

Genes ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 1067
Author(s):  
Ying Wang ◽  
Perot Saelao ◽  
Colin Kern ◽  
Sihua Jin ◽  
Rodrigo A. Gallardo ◽  
...  
Keyword(s):  
Heat Stress ◽  
Newcastle Disease Virus ◽  
Newcastle Disease ◽  
Inbred Lines ◽  
Solute Carrier Family ◽  
Acid Base Balance ◽  
Acid Base ◽  
Liver Transcriptome ◽  
Base Balance ◽  
Solute Carrier

Heat stress results in reduced productivity, anorexia, and mortality in chickens. The objective of the study was to identify genes and signal pathways associated with heat stress and Newcastle disease virus (NDV) infection in the liver of chickens through RNA-seq analysis, using two highly inbred chicken lines (Leghorn and Fayoumi). All birds were held in the same environment until 14 days of age. On day 14, half the birds were exposed to 38 °C with 50% relative humidity for 4 h, then 35 °C until the end of the experiment. The remaining birds were kept at 25 °C throughout the experiment. The heat-treated birds were inoculated at 21 days of age with 107 EID50 (One EID50 unit is the amount of virus that will infect 50 percent of inoculated embryos) NDV La Sota strain to investigate the effects of both heat stress and NDV infection. Physiological parameters were recorded as blood phenotypes at three stages: acute heat (AH), chronic heat (CH1), and chronic heat combined with NDV infection (CH&NDV), at 4 h, 7 days, and 10 days post-initiation of heat treatment, respectively. Our previous work revealed that the heat-resilient Fayoumi line maintained a more stable acid-base balance in their blood compared to the Leghorn line. Liver samples were harvested on both AH and CH&NDV to characterize the transcriptome profiles of these two inbred lines. Both genetic lines and treatments had large impact on the liver transcriptome. Fayoumi birds had more differentially expressed genes (DEGs) than Leghorn birds for both treatments. Metabolic and immune-related genes were on the DEG list, with Fayoumi having more immune-related DEGs than Leghorns, which was confirmed by gene functional enrichment analysis. Weighted correlation network analysis (WGCNA) indicated that the driver genes such as Solute Carrier Family genes could be very important for stabilizing the acid-base balance in Fayoumi birds during heat stress. Therefore, candidate genes such solute carrier family genes could be potential genetic targets that are regulated by Fayoumis to maintain physical hemostasis under heat stress. Differential gene expression showed that Leghorns mainly performed metabolic regulation in response to heat stress and NDV infection, while Fayoumis regulated both immune and metabolic functions. This study provides novel insights and enhances our understandings of liver response to heat stress of heat resilient and susceptible inbred chicken lines.

Effects of mild heat stress and grain challenge on acid-base balance and rumen tissue histology in lambs1

2006 ◽  
Vol 84 (2) ◽  
pp. 447-455 ◽  
Author(s):  
N. E. Odongo ◽  
O. AlZahal ◽  
M. I. Lindinger ◽  
T. F. Duffield ◽  
E. V. Valdes ◽  
...  
Keyword(s):  
Heat Stress ◽  
Acid Base Balance ◽  
Acid Base ◽  
Mild Heat ◽  
Base Balance ◽  
Tissue Histology

Acid-base and ionic balance in Ambystoma tigrinum and Necturus maculosus during hypercapnia

1983 ◽  
Vol 245 (5) ◽  
pp. R689-R694 ◽  
Author(s):  
D. F. Stiffler ◽  
B. L. Tufts ◽  
D. P. Toews
Keyword(s):  
Prolonged Exposure ◽  
Epithelial Transport ◽  
Ambystoma Tigrinum ◽  
Ionic Balance ◽  
Acid Base Balance ◽  
Acid Base ◽  
Necturus Maculosus ◽  
Arterial Ph ◽  
Partial Pressure Of Co2 ◽  
Base Balance

The aquatic urodeles Ambystoma tigrinum and Necturus maculosus responded to hypercapnia quite differently. A. tigrinum, after 2-h exposure to 22 Torr partial pressure of CO2 (PCO2), decreased arterial pH (pHa) from 7.85 to 7.32 and increased arterial pressure of CO2 (PaCO2) to 26 Torr. Plasma [HCO-3] [( HCO-3]pl) remained constant at about 17 mM. Prolonged exposure (24 h) led to a 26% extracellular compensation as pHa rose to 7.46 while [HCO-3]pl increased to 24 mM. Plasma [K+] increased and [Cl-] decreased while [Na+] remained unchanged. Recovery in normocapnic water reversed these changes. N. maculosus did not display similar compensatory changes. Two-hour exposure to 17 Torr PCO2 resulted in a decline of pHa from 7.66 to 7.24, which was not compensated (pHa = 7.19) after 24 h. There were no significant changes in plasma [Na+], [K+], [Cl-], or [HCO-3]. The pHa decline reversed after recovery in normocapnic water, however. The fact that compensation for hypercapnic in A. tigrinum was accompanied by changes in Cl- and K+ concentrations may indicate the participation of epithelial transport mechanisms involving these ions in acid-base balance.

scholarly journals Switch from Metabolic to Ventilatory Compensation of Extracellular pH in Crayfish

1988 ◽  
Vol 137 (1) ◽  
pp. 411-420 ◽  
Author(s):  
B. Burtin ◽  
J.-C. Massabuau
Keyword(s):  
Metabolic Acidosis ◽  
Partial Pressure ◽  
Ph Regulation ◽  
Extracellular Ph ◽  
Hypercapnic Acidosis ◽  
Acid Base Balance ◽  
Acid Base ◽  
Astacus Leptodactylus ◽  
Partial Pressure Of Co2 ◽  
Base Balance

The mechanisms of extracellular pH regulation were studied in crayfish Astacus leptodactylus under conditions that were either favourable or unfavourable for ionoregulation. Animals in intermoult or premoult stages were kept in normoxic artificial waters at 13°C. In intermoult, acid—base balance (ABB) and ionoregulatory disturbances were induced by increasing the ambient partial pressure of CO2 (PwCOCO2), by decreasing the concentration of NaCl in the water ([NaCl]w) or by associating both changes. In premoult we took advantage of the spontaneously occurring endogenous problems of ionoregulation which are linked to shell shedding. In intermoult, an increase of PwCOCO2 alone induced a hypercapnic acidosis compensated by metabolic means, whereas in association with a decrease of [NaCl]w (which induced a decrease of [NaCl] in the haemolymph) it led to a ventilatory compensation. In intermoult a decrease of [NaCl]w alone induced a metabolic acidosis that was compensated by metabolic means, whereas in premoult it was compensated by ventilatory adjustments. It is concluded that when water breathers are facing experimentally induced or spontaneous ionoregulatory problems, compensation for superimposed ABB disturbances can be made by ventilatory adjustments instead of by metabolic means.

scholarly journals Antioxidants Supplementation on Acid Base Balance during Heat Stress in Goats

2010 ◽  
Vol 23 (11) ◽  
pp. 1462-1468 ◽  
Author(s):  
A. V. N. Sivakumar ◽  
G. Singh ◽  
V. P. Varshney
Keyword(s):  
Heat Stress ◽  
Acid Base Balance ◽  
Acid Base ◽  
Base Balance
Sign in / Sign up

Export Citation Format

Share Document