Effect of temperature-humidity index on physiological and haematological indicators in dairy cows [Vliv teplotně-vlhkostního indexu na fyziologické a hematologické ukazatele dojnic]

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F23%3A43924633" target="_blank" >RIV/62156489:43210/23:43924633 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.5513/JCEA01/24.4.3960" target="_blank" >https://doi.org/10.5513/JCEA01/24.4.3960</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5513/JCEA01/24.4.3960" target="_blank" >10.5513/JCEA01/24.4.3960</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of temperature-humidity index on physiological and haematological indicators in dairy cows [Vliv teplotně-vlhkostního indexu na fyziologické a hematologické ukazatele dojnic]

Popis výsledku v původním jazyce

Heat stress in cows is commonly assessed using the temperature and humidity index (THI), a combination of ambient temperature and relative humidity. In this study, the influence of the THI on haematological and other physiological indicators in cows was evaluated. A significant difference was found in respiratory rate; when THI increased above 70 breaths/min, respiratory rate increased from 19.8 to 34.4 breaths/min. When THI increased above 80 breaths/min, there was a sharp increase in respiratory rate to 128.8 breaths/min. This was observed between 3 and 4 clocks in the afternoon when the highest thermal stress was assumed in dairy cows. The correlation coefficient between THI and body temperature was 0.38, but when weighted averages of minimum temperatures for three days were used, the correlation coefficient increased to 0.48. Based on these results, it is more reasonable to use the minimum THI over several days. At critical temperatures, haemoglobin decreased to 115.45 +- 23.12 g/l, compared with values measured in dairy cows under optimal conditions. However, these values did not fall below 125 g/l. A similar trend was observed for hematocrit under optimal conditions it was 34.42 +- 1.03%, and under stress, it was 37.5-39.12%. The number of erythrocytes was the lowest (6.51 +- 0.137 x 1012/l) in the most heat-stressed dairy cow group.

Název v anglickém jazyce

Effect of temperature-humidity index on physiological and haematological indicators in dairy cows [Vliv teplotně-vlhkostního indexu na fyziologické a hematologické ukazatele dojnic]

Popis výsledku anglicky

Heat stress in cows is commonly assessed using the temperature and humidity index (THI), a combination of ambient temperature and relative humidity. In this study, the influence of the THI on haematological and other physiological indicators in cows was evaluated. A significant difference was found in respiratory rate; when THI increased above 70 breaths/min, respiratory rate increased from 19.8 to 34.4 breaths/min. When THI increased above 80 breaths/min, there was a sharp increase in respiratory rate to 128.8 breaths/min. This was observed between 3 and 4 clocks in the afternoon when the highest thermal stress was assumed in dairy cows. The correlation coefficient between THI and body temperature was 0.38, but when weighted averages of minimum temperatures for three days were used, the correlation coefficient increased to 0.48. Based on these results, it is more reasonable to use the minimum THI over several days. At critical temperatures, haemoglobin decreased to 115.45 +- 23.12 g/l, compared with values measured in dairy cows under optimal conditions. However, these values did not fall below 125 g/l. A similar trend was observed for hematocrit under optimal conditions it was 34.42 +- 1.03%, and under stress, it was 37.5-39.12%. The number of erythrocytes was the lowest (6.51 +- 0.137 x 1012/l) in the most heat-stressed dairy cow group.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

40201 - Animal and dairy science; (Animal biotechnology to be 4.4)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Central European Agriculture

ISSN

1332-9049

e-ISSN

1332-9049

Svazek periodika

24

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

HR - Chorvatská republika

Počet stran výsledku

7

Strana od-do

802-808

Kód UT WoS článku

001128571600001

EID výsledku v databázi Scopus

2-s2.0-85180182627