Effects of increasing temperatures on physiological changes in pigs at different relative humidities1

Huynh, T.T.T.; Aarnink, A.J.A.; Verstegen, M.W.A.; Gerrits, W.J.J.; Heetkamp, M.J.W.; Kemp, B.; Canh, T.T.

doi:10.2527/2005.8361385x

Cited by 220 publications

(180 citation statements)

References 13 publications

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“…The THI allows combining the effect of ambient temperature and humidity on the studied traits. It is well recognized that high relative humidities emphasize the negative impact of high ambient temperature on pig performances by limiting evaporative heat losses capacity (Huynh et al, 2005). Above a relative humidity of 80%, the effects of HS on ADFI are magnified (Granier et al, 1998).…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…Furthermore, the regressions suggest the existence of a threshold for space allowance value below which a further reduction in the space provided to pigs would affect the behavioural repertoire of pigs, reducing, in this case, the time devoted to the lying behaviour. In this sense, the use of broken-line regression analysis has proven to be a valuable tool in the determination of critical values when studying the effect of different characteristics of pig-housing environment on their physiology and behaviour (Huynh et al, 2005a and2005b;Aarnink et al, 2006). Broken-line analysis has been also successfully used in the determination of the critical floor space allowance for pigs' performance (Gonyou et al, 2006), suggesting that it might also be helpful in attempting to determine a critical space allowance value affecting the average time growing-finishing pigs spend lying.…”

Section: Discussionmentioning

confidence: 99%

Quantitative assessment of the effects of space allowance, group size and floor characteristics on the lying behaviour of growing-finishing pigs

Averós

Brossard

Dourmad

et al. 2010

Animal

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To obtain quantitative information that can be later used in animal welfare modelling, the relationship between the lying behaviour of growing-finishing pigs (initial body weight (BW) between 19 and 87 kg) and different factors related to the housing conditions, with a potential negative effect on their welfare, was studied by means of a meta-analytical approach. Data from 22 experiments reported in 21 scientific publications were collected. The space allowance, expressed on an allometric basis by means of a k-value (m 2 /BW 0.667 ), the group size (n) and the floor characteristics (fully and partly slatted v. non-slatted floor), as well as their significant two-way interactions were used as fixed effects, and the experiment was used as a random factor to take into account the interexperiment effect. Further regression analyses were performed on the predicted values of observations in order to improve the adjustment of data. A significant quadratic relationship was established between space allowance ( k-value, P , 0.05; squared k-value, P , 0.01) and the percentage of time spent lying. A significant interaction between the k-value and the floor type was also found ( P , 0.05), showing that the relationship between space allowance and lying behaviour is affected by the presence or absence of slats. Threshold k-values were obtained using broken-line analyses, being about 0.039 for slatted floors and almost double for non-slatted floors. Compared to other studies, these values suggest that the ability to rest as space availability decreases may be compromised before a reduced performance becomes apparent. Group size did not show a significant effect. Additional information should be added to the model, as further data become available, to adjust the proposed parameters as well as to try to include the effect of other important aspects such as that of ambient temperature.

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“…This may indicate that the shallow pool system favored thermal equilibrium, diminishing the need for water intake. Increased water consumption is one of the main indicators of heat stress in pigs during the finishing phase (HUYNH et al, 2005), because it permits cooling favoring homeothermy.…”

Section: Resultsmentioning

confidence: 99%

Behavioral, thermoregulatory, and operational aspects of shallow pool pens used in gilts production

Biazzi¹,

Paiano

Nunes

et al. 2014

Sem. Ci. Agr.

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This work was conducted to assess behavioral, thermoregulatory and operational aspects of gilt breeding (Body weight, 25-110 kg) whilst the animals were housed in 2-cm deep shallow pool pens (SPP), without the addition of water, compared to the use of fully compact floor pens (TSF) during the winter and summer seasons. Commercial female strains for high lean tissue accretion were used, housed in grower/finisher pens for 108 days (11 animals/pen, 1.2 m 2 /animal). Instantaneous observations of behavior were carried out every 12 min between 7:00 and 19:00 hours throughout the six days of the raising period. At the end of the raising period, the operational aspects of cleaning the facilities were analyzed. A 2 × 2 factorial scheme design was used, with two types of floors and two seasons, with three replicates. The average temperatures in winter and summer were 19.9 ± 2.2°C and 24.5 ± 2.3°C, respectively. The use of SPP reduced aggressive behavior and increased exploratory behavior, increased the time for the daily cleaning, and reduced the time for the final cleaning of the pens. Key words: Animal welfare, environmental enrichment, facilities, pigs ResumoFoi conduzido um trabalho para avaliar os comportamentos, a termorregulação e os aspectos operacionais da criação de leitoas (25 aos 110 kg de peso vivo) alojadas em lâminas d'água rasa (LDR), com 2 cm de profundidade, sem adição de água em comparação com o piso totalmente compacto (PTC), nas estações de inverno e verão. Foram utilizadas fêmeas de linhagem comercial para alta deposição de tecido magro, alojadas em baias de crescimento/terminação por 108 dias (11 animais por baia, 1,2 m 2 /animal). Foram realizadas observações instantâneas do comportamento, a cada 12 minutos, das 7h00min às 19h00min por seis dias ao longo do período de criação. No final do período de criação foram analisados os aspectos operacionais da limpeza das instalações. Foi utilizado delineamento em um esquema fatorial 2x2, com dois tipos de pisos e duas estações, com três repetições. As temperaturas médias do ar no inverno e verão foram de 19,9±2,2ºC e 24,5±2,3ºC, respectivamente. A utilização de LDR reduziu os comportamentos agressivos e aumentou os comportamentos exploratórios, aumentou o tempo de limpeza diário e reduziu o tempo de limpeza final das baias. Palavras-chave: Bem-estar animal, enriquecimento ambiental, instalações, suínos 1 Zootecnista, Poli-Nutri Nutrição Animal, Treze Tilia, SC, Brasil.

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Effects of increasing temperatures on physiological changes in pigs at different relative humidities1

Cited by 220 publications

References 13 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

Quantitative assessment of the effects of space allowance, group size and floor characteristics on the lying behaviour of growing-finishing pigs

Behavioral, thermoregulatory, and operational aspects of shallow pool pens used in gilts production

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