Association between human and animal thermal comfort indices and physiological heat stress indicators in dairy calves

L. Kovács, F. L. Kézér, F. Ruff, O. Szenci, V. Jurkovich

Research output: Contribution to journalArticle

Abstract

Warm summer episodes have a significant effect on the overall health and well-being of young cattle; however, it is not known which temperature measure should be used for estimating heat stress in dairy calves. In this study, generalized linear mixed-effects models were used to estimate the relationships between thermal comfort indices and animal-based heat stress indicators in sixteen Holstein bull calves that were housed in individual calf hutches. Data were collected under continental weather characteristics over a 5-day period: day 1 (lower-temperature day), days 2 and 3 (heat stress days), and a 2-day post-stress period. Relative humidity, ambient temperature, the heat index, the humidex and five different temperature–humidity indices (THI) were used as thermal indices. Physiological variables monitored included respiratory rate, rectal temperature, ear skin temperature and heart rate. The heat index and the humidex measuring human thermal comfort were more closely associated with physiological measures than were the ambient temperature or the THIs (in case of heat index: R2 = 0.87 for respiratory rate, R2 = 0.63 for rectal temperature, R2 = 0.70 for ear skin temperature, and R2 = 0.78 for heart rate, respectively; in case of humidex: R2 = 0.85 for respiratory rate, R2 = 0.60 for rectal temperature, R2 = 0.68 for ear skin temperature, and R2 = 0.75 for heart rate, respectively). Based on our results, parameters of human outdoor comfort seem better to estimate heat stress in dairy calves in a continental region than those of THIs or ambient temperature.

Original languageEnglish
Pages (from-to)108-111
Number of pages4
JournalEnvironmental Research
Volume166
DOIs
Publication statusPublished - Oct 1 2018

Fingerprint

Dairies
Thermal comfort
Animals
Hot Temperature
animal
Temperature
temperature
Skin Temperature
Respiratory Rate
Ear
skin
Heart Rate
Skin
indicator
index
Weather
Humidity
rate
relative humidity
cattle

Keywords

  • Calves
  • Ear temperature
  • Heart rate
  • Heat index
  • Heat stress
  • Respiratory rate

ASJC Scopus subject areas

  • Biochemistry
  • Environmental Science(all)

Cite this

Association between human and animal thermal comfort indices and physiological heat stress indicators in dairy calves. / Kovács, L.; Kézér, F. L.; Ruff, F.; Szenci, O.; Jurkovich, V.

In: Environmental Research, Vol. 166, 01.10.2018, p. 108-111.

Research output: Contribution to journalArticle

@article{3e8fe76379a84dc18d6948750f19cc3c,
title = "Association between human and animal thermal comfort indices and physiological heat stress indicators in dairy calves",
abstract = "Warm summer episodes have a significant effect on the overall health and well-being of young cattle; however, it is not known which temperature measure should be used for estimating heat stress in dairy calves. In this study, generalized linear mixed-effects models were used to estimate the relationships between thermal comfort indices and animal-based heat stress indicators in sixteen Holstein bull calves that were housed in individual calf hutches. Data were collected under continental weather characteristics over a 5-day period: day 1 (lower-temperature day), days 2 and 3 (heat stress days), and a 2-day post-stress period. Relative humidity, ambient temperature, the heat index, the humidex and five different temperature–humidity indices (THI) were used as thermal indices. Physiological variables monitored included respiratory rate, rectal temperature, ear skin temperature and heart rate. The heat index and the humidex measuring human thermal comfort were more closely associated with physiological measures than were the ambient temperature or the THIs (in case of heat index: R2 = 0.87 for respiratory rate, R2 = 0.63 for rectal temperature, R2 = 0.70 for ear skin temperature, and R2 = 0.78 for heart rate, respectively; in case of humidex: R2 = 0.85 for respiratory rate, R2 = 0.60 for rectal temperature, R2 = 0.68 for ear skin temperature, and R2 = 0.75 for heart rate, respectively). Based on our results, parameters of human outdoor comfort seem better to estimate heat stress in dairy calves in a continental region than those of THIs or ambient temperature.",
keywords = "Calves, Ear temperature, Heart rate, Heat index, Heat stress, Respiratory rate",
author = "L. Kov{\'a}cs and K{\'e}z{\'e}r, {F. L.} and F. Ruff and O. Szenci and V. Jurkovich",
year = "2018",
month = "10",
day = "1",
doi = "10.1016/j.envres.2018.05.036",
language = "English",
volume = "166",
pages = "108--111",
journal = "Environmental Research",
issn = "0013-9351",
publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Association between human and animal thermal comfort indices and physiological heat stress indicators in dairy calves

AU - Kovács, L.

AU - Kézér, F. L.

AU - Ruff, F.

AU - Szenci, O.

AU - Jurkovich, V.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - Warm summer episodes have a significant effect on the overall health and well-being of young cattle; however, it is not known which temperature measure should be used for estimating heat stress in dairy calves. In this study, generalized linear mixed-effects models were used to estimate the relationships between thermal comfort indices and animal-based heat stress indicators in sixteen Holstein bull calves that were housed in individual calf hutches. Data were collected under continental weather characteristics over a 5-day period: day 1 (lower-temperature day), days 2 and 3 (heat stress days), and a 2-day post-stress period. Relative humidity, ambient temperature, the heat index, the humidex and five different temperature–humidity indices (THI) were used as thermal indices. Physiological variables monitored included respiratory rate, rectal temperature, ear skin temperature and heart rate. The heat index and the humidex measuring human thermal comfort were more closely associated with physiological measures than were the ambient temperature or the THIs (in case of heat index: R2 = 0.87 for respiratory rate, R2 = 0.63 for rectal temperature, R2 = 0.70 for ear skin temperature, and R2 = 0.78 for heart rate, respectively; in case of humidex: R2 = 0.85 for respiratory rate, R2 = 0.60 for rectal temperature, R2 = 0.68 for ear skin temperature, and R2 = 0.75 for heart rate, respectively). Based on our results, parameters of human outdoor comfort seem better to estimate heat stress in dairy calves in a continental region than those of THIs or ambient temperature.

AB - Warm summer episodes have a significant effect on the overall health and well-being of young cattle; however, it is not known which temperature measure should be used for estimating heat stress in dairy calves. In this study, generalized linear mixed-effects models were used to estimate the relationships between thermal comfort indices and animal-based heat stress indicators in sixteen Holstein bull calves that were housed in individual calf hutches. Data were collected under continental weather characteristics over a 5-day period: day 1 (lower-temperature day), days 2 and 3 (heat stress days), and a 2-day post-stress period. Relative humidity, ambient temperature, the heat index, the humidex and five different temperature–humidity indices (THI) were used as thermal indices. Physiological variables monitored included respiratory rate, rectal temperature, ear skin temperature and heart rate. The heat index and the humidex measuring human thermal comfort were more closely associated with physiological measures than were the ambient temperature or the THIs (in case of heat index: R2 = 0.87 for respiratory rate, R2 = 0.63 for rectal temperature, R2 = 0.70 for ear skin temperature, and R2 = 0.78 for heart rate, respectively; in case of humidex: R2 = 0.85 for respiratory rate, R2 = 0.60 for rectal temperature, R2 = 0.68 for ear skin temperature, and R2 = 0.75 for heart rate, respectively). Based on our results, parameters of human outdoor comfort seem better to estimate heat stress in dairy calves in a continental region than those of THIs or ambient temperature.

KW - Calves

KW - Ear temperature

KW - Heart rate

KW - Heat index

KW - Heat stress

KW - Respiratory rate

UR - http://www.scopus.com/inward/record.url?scp=85048464044&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85048464044&partnerID=8YFLogxK

U2 - 10.1016/j.envres.2018.05.036

DO - 10.1016/j.envres.2018.05.036

M3 - Article

C2 - 29885611

AN - SCOPUS:85048464044

VL - 166

SP - 108

EP - 111

JO - Environmental Research

JF - Environmental Research

SN - 0013-9351

ER -