Effect of temperature level on thermal acclimation in Large White growing pigs

Renaudeau, David; Kerdoncuff, M.; Anais, Caroline; Gourdine, Jean-Luc

doi:10.1017/s1751731108002814

Cited by 54 publications

(37 citation statements)

References 21 publications

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“…As proposed by Renaudeau et al (2008), a thermal circulation index (TCI) was calculated as an indicator of blood and heat transfer to the skin under steady-state thermal conditions. However, the ambient temperature was replaced in the initial formulae by the average THI during lactation as follows:…”

Section: Methodsmentioning

confidence: 99%

Genetic parameters for thermoregulation and production traits in lactating sows reared in tropical climate

Gourdine

Mandonnet

Giorgi³

et al. 2017

Animal

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The objective of this study was to estimate the genetic parameters for thermoregulation traits and the relationships with performance of Large White lactating sows reared in a tropical humid climate. The thermoregulation traits were rectal temperature (RT), cutaneous temperature (CT) and respiratory rate (RR) during lactation measured in the afternoon (1200 h) and in the morning (0700 h). The production traits were sow's average daily feed intake (ADFI), litter BW gain (LBWg) and sow's proportion of BW change between farrowing and weaning (BWc). Complete data included 931 lactating performance on 329 Large White sows from the INRA experimental unit in Guadeloupe (French West Indies). Random regression models using linear spline functions were used for longitudinal data (RT, CT, RR and daily feed intake). Results showed that when ignoring values at the beginning and the end of lactation, the traits studied can be treated as the same trait throughout days of lactation, with fairly constant heritability and variance. However, largest heritabilities and genetic variances were estimated in mid-lactation. Heritability estimates on average performance during lactation were low to moderate for thermoregulation traits (0.35 ± 0.09 for RT, 0.34 ± 0.12 for CT and 0.39 ± 0.13 for RR). Heritability estimates for production traits were 0.26 ± 0.08 for ADFI, 0.20 ± 0.07 for BWc and 0.31 ± 0.09 for LBWg. Significant genetic correlations between thermoregulation traits and production traits were only obtained for ADFI and RR (0.35 ± 0.12). From this study it can be concluded that thermoregulation traits are heritable, indicating that there are genetic differences in heat stress tolerance in lactating Large White sows.

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Section: Methodsmentioning

confidence: 99%

Genetic parameters for thermoregulation and production traits in lactating sows reared in tropical climate

Gourdine

Mandonnet

Giorgi³

et al. 2017

Animal

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“…Continuous measurements of temperature could also be an interesting and efficient tool to prevent heat stress (Laburn et al, 2002;Renaudeau et al, 2008;Green et al, 2009), or for genetic selection of animals more tolerant to ambient conditions or extreme variations (Dikmen et al, 2009). A brief review of the advantages of continuous temperature monitoring in cattle has been made by Schutz and Bewley (2009)…”

Section: About Homeothermymentioning

confidence: 99%

“…In these studies, methods were not telemetric but they allowed Lowe et al (2001) to illustrate an interaction between meteorological conditions and circadian rhythm in pastoral sheep, Piccione et al (2005) to study the circadian rhythm pattern of goat, sheep, cattle and horse temperature, and Renaudeau et al (2008) to define a thermal circulation index between body core and skin, which varied in relation with heat stress.…”

Section: Temperature Measurement With Non Invasive Contact Sensorsmentioning

confidence: 99%

A Review of Methods to Measure Animal Body Temperature in Precision Farming

Sellier¹,

Guettier²,

Staub³

2014

AJAST

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Automation of phenotypic measurements of livestock has become a more important goal for scientists and also for farmers who need a more precise, real-time knowledge of their animals. Among physiological measures, body temperature and its variations are key indicators of the physiological health and well-being of animals. Although measuring the body temperature may seem a trivial matter, its implementation is faced with many difficulties both at biological and technological levels in a field of constant progress. Today, there are many studies reporting taking temperature measurements without restraining animals. The present report focuses on the two main approaches to temperature measurements that use direct contact or radiation sensors. Specifically, we investigated the use of thermocouples, thermistors and infrared radiation sensors. A wide literature review using one of these techniques was conducted in which different animal species, different purposes, different experimental designs, various equipments, and different devices and gold standard methods are discussed. These technologies will continue their dizzying development, leading to new communication protocols, sensors miniaturization and a more efficient management of energy. These developments will have a direct impact on the increase of reading distances and the amount of information stored. In response to the request of farmers and researchers, integrated monitoring systems are already marketed with user-friendly interfaces and softwares for complex data storage and treatments.

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“…The use of cooling system can be used to reduce the negative effects of heat stress on animals (TEIXEIRA et al, 2004;THUY, 2005;AUVIGNE et al, 2010) and acclimation to a particular conditions have a large impact on the animal's heat production, performance and thermoregulatory responses RENAUDEAU et al, 2008).…”

Section: Thermoregulation and Sensible Heat Loss Of The Sowmentioning

confidence: 99%

The impact of evaporative cooling on the thermoregulation and sensible heat loss of sows during farrowing

et al. 2014

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ABSTRACT:Pigs are more sensitive to high environmental temperatures explained by the inability of sweating and panting properly when compared to other species of farmed livestock. The evaporative cooling system might favor the thermal comfort of animals during exposure to extreme environmental heat and reduce the harmful effects of heat stress. The purpose of this study was to assess the sensible heat loss and thermoregulation parameters from lactating sows during summer submitted to two different acclimatization systems: natural and evaporative cooling. The experiment was carried out in a commercial farm with 72 lactating sows. The ambient variables (temperature, relative humidity and air velocity) and sows physiological parameters (rectal temperature, surface temperature and respiratory rate) were monitored and then the sensible heat loss at 21days lactation was calculated. The results of rectal temperature did not differ between treatments. However, the evaporative cooling led to a significant reduction in surface temperature and respiratory rate and a significant increase in the sow's sensible heat loss. It was concluded that the use of evaporative cooling system was essential to increase sensible heat loss; thus, it should reduce the negative effects of heat on the sows' thermoregulation during summer.KEYWORDS: ventilation, thermal stress, panting, surface temperature, swine, lactation. IMPACTO DO RESFRIAMENTO EVAPORATIVO NA TERMORREGULAÇÃO E NA TROCA DE CALOR SENSÍVEL DE PORCAS NA MATERNIDADERESUMO: Em comparação com outras espécies de animais de criação comercial, os suínos são mais sensíveis à temperatura ambiente elevada, pois são incapazes de suar, e a respiração ofegante não é eficiente. O sistema de resfriamento evaporativo pode favorecer o conforto térmico dos animais durante a exposição a altas temperaturas e reduzir os efeitos prejudiciais do estresse térmico. Objetivou-se com este estudo avaliar a troca de calor sensível e os parâmetros de termorregulação de porcas em lactação submetidas a dois sistemas de climatização: natural e resfriamento evaporativo, durante o verão. O experimento foi conduzido em uma granja comercial com 72 porcas em lactação, no qual foram monitoradas as variáveis ambientais (temperatura, umidade relativa do ar e velocidade do ar), os parâmetros fisiológicos das porcas (temperatura retal, temperatura superficial e frequência respiratória) e, assim, foi calculada a troca de calor sensível no período de 21 dias de lactação. Os resultados não indicaram efeito significativo dos sistemas de climatização sobre a temperatura retal. Porém, o resfriamento evaporativo proporcionou redução significativa na temperatura superficial e na frequência respiratória, além do aumento significativo na troca de calor sensível das porcas. A utilização do resfriamento evaporativo contribuiu para aumentar a perda de calor sensível, e, portanto, este sistema pode amenizar os efeitos negativos do calor na termorregulação das porcas lactantes durante o verão.

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Effect of temperature level on thermal acclimation in Large White growing pigs

Cited by 54 publications

References 21 publications

Genetic parameters for thermoregulation and production traits in lactating sows reared in tropical climate

Genetic parameters for thermoregulation and production traits in lactating sows reared in tropical climate

A Review of Methods to Measure Animal Body Temperature in Precision Farming

The impact of evaporative cooling on the thermoregulation and sensible heat loss of sows during farrowing

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