Staff View: Infrared thermography as a method for evaluating the heat tolerance in dairy cows

Infrared thermography as a method for evaluating the heat tolerance in dairy cows

The objective of this study was to determine whether infrared thermography is a useful tool for the recognition of dairy cows in a state of thermal heat stress, as well as to identify the best region of the animal to be evaluated for this recognition. Physiological variables, including rectal temper...

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Main Authors:	Daltro, Darlene dos Santos, Fischer, Vivian, Alfonzo, Evelyn Priscila München, Dalcin, Vanessa Calderaro, Stumpf, Marcelo Tempel, Kolling, Giovani Jacob, Silva, Marcos Vinícius Gualberto Barbosa da, Pimentel, Concepta Margaret McManus
Format:	Artigo
Language:	English
Published:	Sociedade Brasileira de Zootecnia 2018
Subjects:	Animais - proteção Bovino de leite Conforto térmico
Online Access:	http://repositorio.unb.br/handle/10482/30824 http://dx.doi.org/10.1590/s1806-92902017000500002
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spelling	ir-10482-308242020-07-02T12:45:52Z Infrared thermography as a method for evaluating the heat tolerance in dairy cows Daltro, Darlene dos Santos Fischer, Vivian Alfonzo, Evelyn Priscila München Dalcin, Vanessa Calderaro Stumpf, Marcelo Tempel Kolling, Giovani Jacob Silva, Marcos Vinícius Gualberto Barbosa da Pimentel, Concepta Margaret McManus Animais - proteção Bovino de leite Conforto térmico The objective of this study was to determine whether infrared thermography is a useful tool for the recognition of dairy cows in a state of thermal heat stress, as well as to identify the best region of the animal to be evaluated for this recognition. Physiological variables, including rectal temperature, respiratory frequency, cardiac frequency, and panting score were recorded in 38 lactating cows. For the assessment of environmental parameters, a digital black globe thermometer (TGD-200 model) was used. Thermographic photographs of different regions of the body of cows were taken using an infrared camera (FLIR® System T300) and indicated respective superficial temperature. Physiological variables and superficial body temperature in different regions varied between genetic groups (Girolando: ½ Holstein × ½ Gir and ¾ Holstein × ¼ Gir; purebred Holstein). The environmental temperature ranged from 20.7 to 37.9 °C with a relative humidity reaching 95%. The mean rectal temperature (40.84 °C), respiratory frequency (111.36 breaths/min), and cardiac frequency (99.22 beats/min) were higher for pure Holstein than for Girolando cows. Positive correlations were found between the physiological parameters and thermographic measures. The highest positive correlation (0.74) was found between the temperature in the lateral region of the udder and rectal temperature. Thermography is a good indicator of thermal comfort. The best region to identify heat stress in cows using thermography is the lateral region of the udder. 2018-01-04T19:15:07Z 2018-01-04T19:15:07Z 2017-05 Artigo DALTRO, Darlene dos Santos et al. Infrared thermography as a method for evaluating the heat tolerance in dairy cows. Revista Brasileira de Zootecnia, Viçosa, v. 46, n. 5, p. 374-383, maio 2017. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000500374&lng=en&nrm=iso>. Acesso em: 17 jan. 2018. doi: http://dx.doi.org/10.1590/s1806-92902017000500002. http://repositorio.unb.br/handle/10482/30824 http://dx.doi.org/10.1590/s1806-92902017000500002 en Acesso Aberto Revista Brasileira de Zootecnia - This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000500374&lng=en&nrm=iso. Acesso em: 17 jan. 2018. application/pdf Sociedade Brasileira de Zootecnia
institution	REPOSITORIO UNB
collection	REPOSITORIO UNB
language	English
topic	Animais - proteção Bovino de leite Conforto térmico
spellingShingle	Animais - proteção Bovino de leite Conforto térmico Daltro, Darlene dos Santos Fischer, Vivian Alfonzo, Evelyn Priscila München Dalcin, Vanessa Calderaro Stumpf, Marcelo Tempel Kolling, Giovani Jacob Silva, Marcos Vinícius Gualberto Barbosa da Pimentel, Concepta Margaret McManus Infrared thermography as a method for evaluating the heat tolerance in dairy cows
description	The objective of this study was to determine whether infrared thermography is a useful tool for the recognition of dairy cows in a state of thermal heat stress, as well as to identify the best region of the animal to be evaluated for this recognition. Physiological variables, including rectal temperature, respiratory frequency, cardiac frequency, and panting score were recorded in 38 lactating cows. For the assessment of environmental parameters, a digital black globe thermometer (TGD-200 model) was used. Thermographic photographs of different regions of the body of cows were taken using an infrared camera (FLIR® System T300) and indicated respective superficial temperature. Physiological variables and superficial body temperature in different regions varied between genetic groups (Girolando: ½ Holstein × ½ Gir and ¾ Holstein × ¼ Gir; purebred Holstein). The environmental temperature ranged from 20.7 to 37.9 °C with a relative humidity reaching 95%. The mean rectal temperature (40.84 °C), respiratory frequency (111.36 breaths/min), and cardiac frequency (99.22 beats/min) were higher for pure Holstein than for Girolando cows. Positive correlations were found between the physiological parameters and thermographic measures. The highest positive correlation (0.74) was found between the temperature in the lateral region of the udder and rectal temperature. Thermography is a good indicator of thermal comfort. The best region to identify heat stress in cows using thermography is the lateral region of the udder.
format	Artigo
author	Daltro, Darlene dos Santos Fischer, Vivian Alfonzo, Evelyn Priscila München Dalcin, Vanessa Calderaro Stumpf, Marcelo Tempel Kolling, Giovani Jacob Silva, Marcos Vinícius Gualberto Barbosa da Pimentel, Concepta Margaret McManus
author_sort	Daltro, Darlene dos Santos
title	Infrared thermography as a method for evaluating the heat tolerance in dairy cows
title_short	Infrared thermography as a method for evaluating the heat tolerance in dairy cows
title_full	Infrared thermography as a method for evaluating the heat tolerance in dairy cows
title_fullStr	Infrared thermography as a method for evaluating the heat tolerance in dairy cows
title_full_unstemmed	Infrared thermography as a method for evaluating the heat tolerance in dairy cows
title_sort	infrared thermography as a method for evaluating the heat tolerance in dairy cows
publisher	Sociedade Brasileira de Zootecnia
publishDate	2018
url	http://repositorio.unb.br/handle/10482/30824 http://dx.doi.org/10.1590/s1806-92902017000500002
_version_	1672205438603493376
score	13.657419

Infrared thermography as a method for evaluating the heat tolerance in dairy cows

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