Análise Do Conforto Térmico No Estado Do Rio Grande Do Sul Utilizando Técnicas Geoestatísticas E Dados Das Normais Climatológicas

Oliveira, Zanandra Boff de; Bottega, Eduardo Leonel; Oliveira, Marília Boff de; Silva, Clarissa Moares da; Link, Tiago Tondolo

doi:10.13083/reveng.v27i3.935

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Therefore, it is verified that the animals subjected to forced ventilation consumed more feed, confirming the results found by Oliveira et al (2019b), when assessing climate control systems for growing pigs. Brustolini & Fontes (2014) state that under temperature conditions above the upper critical temperature (UCT), the effects on pig weight gain is a factor of great relevance because, at each centigrade degree of increment there is a 55 g reduction in feed intake.…”

Section: Resultssupporting

confidence: 83%

“…There was a high local thermal amplitude, with value of 13.22 °C in the external environment, with minimum recorded at 5 h and maximum recorded at 13 h ( Figure 1A). According to Oliveira et al (2019b), the range tolerated by adult pigs is 8.0 °C. Santos et al (2012) found a difference of 3.5 °C when reducing the thermal amplitude of a shed with pigs using forced ventilation associated with nebulization, compared to natural ventilation.…”

Section: Resultsmentioning

confidence: 99%

“…Enthalpy showed significant differences at all evaluation times and reached critical values at 12 h ( Figure 2D) in pens with no climate control (72.2 kJ kg -1 ), with forced ventilation (66.56 kJ kg -1 ) and with evaporative cooling (62.25 kJ kg -1 ). Oliveira et al (2019b) point out that the effect of nebulization associated with mechanical ventilation attenuates the amount of energy present in the air volume, with emphasis on meeting the need for thermal comfort of pigs, when compared to forced ventilation (62.28 kJ kg -1 ) and natural ventilation (72.87 kJ kg -1 ).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Performance of growing pigs subjected to lighting programs in climate-controlled environments

Barnabé

Pandorfi

Gomes

et al. 2020

Rev. bras. eng. agríc. ambient.

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The objective of this research was to evaluate the thermal comfort, physiological responses and performance of pigs in the growth phase, subjected to supplemental lighting programs in air-conditioned environments, in semiarid region of Pernambuco state, Brazil. Twenty-seven pigs (3/4 Duroc, ¼ Pietrain) were subjected to pens with no climate control, pens with forced ventilation and pens with adiabatic evaporative cooling, associated with 12 h of natural light, 12 h of natural light + 4 h of artificial light and 12 h of natural light + 6 h of artificial light. The experimental design was completely randomized, in a 3 x 3 factorial arrangement with three repetitions. Meteorological responses, physiological responses and performance variables of the animals were recorded. The evaporative cooling system attenuated the action of the stressors and ensured adequate thermal conditions for the animals. Respiratory rate and rectal temperature indicated that evaporative cooling ensured the maintenance of homeothermy. Weight gain and feed conversion were positively influenced for the animals exposed to evaporative cooling, but without significant effect of lighting programs.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Performance of growing pigs subjected to lighting programs in climate-controlled environments

Barnabé

Pandorfi

Gomes

et al. 2020

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

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Methods for determining the emission of greenhouse gases in swine farming

Nunes

Pecoraro

Gonçalves

et al. 2023

Rev. bras. eng. agríc. ambient.

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Swine production systems contribute to emission of greenhouse gases (CO2, N2O, and CH4) and ammonia (NH3) into the atmosphere. Therefore, the objective of this study was to evaluate methods for determining the emissions of ammonia and greenhouse gases (GHG) in a commercial swine production unit with natural ventilation during the finishing phase. The concentrations of gases in the air were measured using a gas analyzer (INNOVA 1412), and the flow emission was calculated by considering the ventilation rate and the differences in gas concentration between the interior and exterior of the installation. The results showed that the emission flow obtained via the simplified method in [g per swine h-1] was 2.689, 0.30, 4.39, 13.55, and 3.273 for CO2, N2O, CH4, NH3, and water vapor, respectively. The flow obtained using the continuous method in [g per swine h-1] was 574, 0.67, 19.50, 5.84, and 7.2 for CO2, N2O, CH4, NH3, and water vapor, respectively. The proposed simplified method was highly accurate for estimating GHG emissions from swine production systems with natural ventilation.

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Temperature and Humidity Index (THI) during the 2021/2022 summer and its impact on dairy cattle in Rio Grande do Sul, Brazil

Tazzo,

Tarouco,

Allem Junior

et al. 2024

Ciênc. anim. bras.

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This study aimed to calculate the temperature and humidity indexes (THIs) derived from extremely high air temperatures during the months of December 2021, January, and February 2022 in Rio Grande do Sul. The main goal was to characterize and regionalize potential impacts on dairy production. We used hourly measurements of temperature and relative humidity from 28 meteorological stations of the INMET/SIMAGRO/SEAPI network. These data cover ten ecoclimatic regions of the state. THI and Estimated Milk Loss (EML) were calculated, with the daily number of hours classified under each THI category during the trimester by municipality and region. The effects of region and month on THI and EML were evaluated through analysis of variance at a 5% significance level. Differences between means were compared using the Tukey HSD test (P<0.05). The probability of each daily hour having a THI in thermal discomfort (THI>70) was determined through analysis of variance for binomial variables by region, with the observed effect of time (P<0.05), and means were compared using the non-parametric Bonferroni test at 5%. To group these data, we applied the ScottKnott test. The Baixo Vale do Uruguai stood out in the trimester with the highest THI values, indicating thermal discomfort. Conversely, no heat stress was indicated in the Serra do Nordeste. In all regions, the most frequent daily classification of thermal discomfort ranged from attention to alert, with January being particularly significant. The highest EML estimates for most of the eight production levels were recorded in January. High estimates of productivity loss occurred in cows with higher milk production potential.

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Análise Do Conforto Térmico No Estado Do Rio Grande Do Sul Utilizando Técnicas Geoestatísticas E Dados Das Normais Climatológicas

Cited by 5 publications

References 5 publications

Performance of growing pigs subjected to lighting programs in climate-controlled environments

Performance of growing pigs subjected to lighting programs in climate-controlled environments

Methods for determining the emission of greenhouse gases in swine farming

Temperature and Humidity Index (THI) during the 2021/2022 summer and its impact on dairy cattle in Rio Grande do Sul, Brazil

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