Efeito das condições ambientais no nível de ruído emitido por leitões

Abstract

RESUMO:Objetivou-se, com este trabalho, avaliar a influência das variáveis ambientais nos níveis de ruídos emitidos por suínos e quantificar as faixas em dB comparativamente às condições de conforto térmico estabelecidas pela literatura. O experimento foi conduzido em câmara climática, onde foram alojados cinco leitões em fase de creche, submetidos à variação na temperatura ambiente de 20°C a 38°C e umidade relativa de 50% a 80%. Decibelímetros foram instalados para o registro dos níveis de ruídos e sensores dataloggers para os dados de temperatura e umidade relativa. O nível de atividade foi utilizado para quantificar a movimentação dos animais por intermédio de análise de imagens. Análises de correlação e regressão foram aplicadas nos dados para análise estatística. As variáveis ambientais influenciam na emissão de ruídos pelos leitões quando expostos a diferentes condições térmicas. Os níveis de ruídos foram estabelecidos em faixas de acordo com a condição térmica a que animais foram submetidos. Para a condição de conforto (20 a 23°C), níveis de ruídos na faixa de 70 a 75dB; condição de alerta (23 a 30°C), níveis de ruídos na faixa de 60 a 70dB e para condição de estresse térmico (acima de 30°C), na faixa de 55 a 60dB.PALAVRAS-CHAVE: ruído animal; vocalização; temperatura; decibelímetro. EFFECTS OF ENVIRONMENTAL CONDITIONS ON SOUND LEVEL EMITTED BY PIGLETS ABSTRACT:The objective of this study was to assess the influence of environmental variables on sound level emitted by piglets, and to quantify the sound bands using dB compared to the conditions of thermal comfort established by the literature. The experiment was carried out at a climatic chamber, where five piglets at nursery stage were housed and submitted to a variation of the ambient temperature ranging from 28ºC to 38ºC and relative humidity ranging from 50% to 80%. Sound level meters were installed to record sound levels, and data loggers to record temperature and relative humidity data. The level of activity was used to quantify the animals' movement by means of image analysis. Correlation and regression analysis were applied in data for statistical analysis. Environmental variables have influence the sound level emitted by piglets when they are exposed to different thermal conditions. The sound levels were established in bands according to the thermal condition in which the animals are submitted. For comfort condition (20 to 23°C), sound level ranges from 70 to 75dB; for alert condition (23 to 30°C), sound level ranges from 60 to 70dB; and for thermal stress condition (above 30°C), it ranges from 55 to 60dB.

Thermal Insulation With Recycled Material in Creeps for Piglets

“…Since the relative humidity of the air happens as a function of air temperature, the higher the air temperature is, the greater will be the air capacity to retain the water vapor, without affecting the thermoregulation and performance of the piglets (Barros et al, 2015). The relative air humidity did not reach the comfort range of 50-70%, recommended by Miranda et al (2012) in both treatments. According to Huynh et al (2005), the daily weight gain of piglets is impaired when the combination of high temperature and high relative humidity occurs which was not observed in this experiment.…”

Physiological Parameters of Pigs Raised with and without Environmental Enrichment

“…9, No. 4; AH was negatively correlated with RR (-0.34), HR (-0.37) and RT (-0.42), demonstrating that the animals activated their thermoregulatory mechanisms to a greater extent, as a reductionin the percentage of air moisture occurred, a result similar to AT (-0.82), but in the opposite direction, indicating that the increase in temperature caused a reduction of humidity, with AH values lower than 50% being considered uncomfortable for animals in nursery stage (Miranda et al, 2012).…”

“…Regarding the AH, the afternoon shift had less (p > 0.05) amount of water in the air, possibly because of the AT having achieved an average temperature of 36.22 ºC, thus rendering a dryer and uncomfortable air to breath. Miranda et al (2012), working with pigs in nursery stage, considered that AH should remain between 50-70%, with the optimal value for this breeding stage being of 70%, according to Lima et al (2011). Figure 01 shows the existence of this BGHI variation observed between the morning and afternoon shifts.…”

Financial losses in pork supply chain: a study of the pre-slaughter handling impacts

“…Management process speed may cause stress for animals during truck loading, travelling and unloading operations (LUDTKE et al, 2012). Assessing this stress may further help reducing the losses (CORDEIRO et al, 2012;MIRANDA et al, 2012). According to EMBRAPA (2012), after three-hour trip, animals require especial attention as they get very stressed, which can be further damaged by fasting.…”