Thermal comfort of sows in free-range system in Brazilian Savanna

Mós, João Victor do Nascimento; Nascimento, Sheila Tavares; Murata, Luci Sayori; Santos, Vinícius Machado dos; Neto, Antônio José Steidle; Oliveira, Evandro Menezes de; Lisboa, Áquila da Silva; Silva, Luana de Freitas

doi:10.1016/j.jtherbio.2019.102489

Cited by 14 publications

(9 citation statements)

References 13 publications

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“…The effectiveness of natural shading was reported too by Karvatte et al (2016) that studied the impact of shading in integrated crop-livestockforest systems with different arrangements of eucalyptus and native trees, verified reduction of 28.3% of the radiant thermal load and 10.2% in the black globe temperature and humidity index in the shade, proving that shading is an effective way to develop the environmental thermal comfort. Mós et al (2020) when investigating the thermal comfort of sows in the freerange system in Brazilian savanna noted that good sources of shading are important to animals when they are exposed to solar radiation, being verified that the animals prefer the environment with low solar radiation.…”

Section: Discussionmentioning

confidence: 98%

Thermal environment in mobile shelters with different cover types used for chicken housing at the semi-extensive rearing system

et al. 2020

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In tropical climate countries, animal production faces a huge challenge, being the high solar irradiation levels an important factor that negatively influences the welfare and animal performance. The purpose of this research was to check the environment inside mobile shelters with different kinds of cover materials. This research has been developed at the State University of Goiás, Brazil, being used four different cover materials: DFPC, double-faced plastic canvas; PVC, polyvinyl chloride; VFB, tiles made with vegetable fiber and bitumen; and VFBW, tiles made with vegetable fiber and bitumen being the outer face painted white. Covers were placed up mobile shelters with the following dimensions: 1 m length × 1 m width × 1 m height and cover pitch of 30°. The environment was evaluated through thermal comfort indexes: enthalpy (H), temperature and humidity index (THI), black globe and humidity index (BGHI), mean radiant temperature (MRT) and thermal heat load (THL), and the measurement of thermal environmental variables (temperature of external (EST) and internal (IST) surface of the cover, dry bulb temperature (T db ), black globe temperature (T bg ), relative humidity (RH), and wind speedy (WS)). Data analysis was performed using PROC MIXED of SAS® by analysis of variance (ANOVA), followed by the Tukey test, at 5% of significance level. There was observed beneficial effect of the usage of shading, with a decrease in air temperature and thermal comfort indexes when compared with the unshaded environment. The materials presented different thermal behavior, with better results for PVC and VFBW, that presented lower internal (IST) and external surface temperature (EST), in addition to lower black globe temperature, thermal heat load, and black globe and humidity index. PVC and VFBW were the best types of covers evaluated, with significant decreased thermal comfort indexes.

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Section: Discussionmentioning

confidence: 98%

Thermal environment in mobile shelters with different cover types used for chicken housing at the semi-extensive rearing system

et al. 2020

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“…al., 2020). These meteorological factors directly affect animals raised on pasture because it is a type of farming that does not provide favorable conditions related to thermal comfort (Mós et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…The free-range system for laying hens brings the concept of opening the housing so that the hens have access to the outside area or are raised outdoors, to provide better welfare conditions (Yilmaz Dikmen et al, 2016; Gosling et al, 2014;HFAC, 2018), and meet the behavioural domain (Mellor and Beausoleil, 2015). However, despite providing the expression of natural behaviours such as wing apping, scratching, perching, stretching, sand bathing among others (Bestman, 2014;Thimotheo, 2016; HFAC, 2018; Bartzike et al, 2019), which are not observed in the cage system, the meteorological factors directly affect the use of this system mainly by not providing favorable conditions related to thermal comfort (Mós et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Solar Radiation Limits the Use of Paddocks by Laying Hens Raised in the Free-range System

Oliveira

Mós

et al. 2021

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Laying hens on the Free-range systems are susceptible to challenging situations in relation to the rearing environment. Therefore, this work evaluated how solar radiation influences the behaviour of laying hens raised in a Free-range system, in the Brazilian Savanna. The activities included data collection of meteorological variables and behavioural analysis of three-hundred commercial laying hens in relation to the frequency of use of indoor and outdoor areas of rearing housing. The solar radiation is the main factor that directly affects the heat gain of production animals, in this experiment had a high amplitude during all day, going from 33.42 W m-2, to 756.98 W m-2. It was observed that the highest frequency of 79% and 91% use of the barn areas by the hens was at 8am and 4pm, respectively. The internal area of the housing was more used by hens 87% and 68% at 12h and 14h, respectively. Hens were not observed in the paddocks at noon and 2 pm. Hens spend more than 6 hours of the day inside the housing to provide shelter from solar radiation. Which the conclusion the solar radiation influences the behaviour of laying hens, at times of the day of the higher incidence of radiation, and high air and global temperatures, it was not observed the presence of hens in the external areas of the housing, especially with the use of the paddocks, at these times the hens seek shelter inside the housing to get away from the incidence of direct solar radiation.

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“…Large buildings are being constructed for large farms, with no columns suitable for full mechanization and automation of production processes. Intensive breeding and high animal density increases the microclimate requirements in buildings, which are directly linked to the use of heating and cooling systems [5,6]. For their part, cooling and heating systems must have low energy consumption and, where possible depending on the region, use the potential of renewable energy sources [7,8].…”

Section: Engineeringmentioning

confidence: 99%

Development and Analysis of a New Approach for Simplified Determination of the Heating and the Cooling Loads of Livestock Buildings

2021

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Pig farming is a sector of animal husbandry, the development of which is great attention. The pork market occupies a large share in the trade in animal products. In the conditions of they do competition more efforts are made to improve the quality and reduce the cost of production. To achieve this goal, work is being done in several areas – development and expansion of the gene pool, improvement of the living environment in the premises for animal husbandry, reduction of energy costs. Along with the development of feeding technologies, it is necessary to create a suitable microclimate in the premises, in which the animals to realize their productive potential, which in turn is directly related to the use of heating and cooling systems. The design of these systems for both existing and new buildings is carried out according to generally accepted methodologies, which in turn require time for calculation and use of specialized software. The methodologies for determining the loads for heating and cooling of livestock buildings, in accordance with the current legislation in the Republic of Bulgaria, are compared with a new method proposed in this publication. The possibility to consider a livestock building from the point of view of the theory of heat exchange allows the use of the basic differential equations describing the dynamic interaction of the building with the environment. This description would be complete and complex to implement. Therefore, the method of dimensional analysis is used, which is based on generalized indicators, when fulfilling certain criteria of similarity. The aim of the new methodology is to shorten the design time and allow the rapid sizing of heating and cooling systems in livestock buildings. In developing the new methodology, the task was the proposed new approach to summarize the interaction of all physical parameters affecting the heat exchange between the building and the surrounding air, allowing to take into account changes in external (air temperature, wind speed, solar radiation intensity) and internal factors (heat given off by farm animals, lighting, process equipment and processes) affecting the heat exchange between the building and the ambient air

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Thermal comfort of sows in free-range system in Brazilian Savanna

Cited by 14 publications

References 13 publications

Thermal environment in mobile shelters with different cover types used for chicken housing at the semi-extensive rearing system

Thermal environment in mobile shelters with different cover types used for chicken housing at the semi-extensive rearing system

Solar Radiation Limits the Use of Paddocks by Laying Hens Raised in the Free-range System

Development and Analysis of a New Approach for Simplified Determination of the Heating and the Cooling Loads of Livestock Buildings

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