Consulta: subjectFacets:"Thermal comfort"
Registros recuperados: 49
Data/hora: 12/06/2024 16:22:57

BEHAVIOR OF BROILERS UNDER THE INFLUENCE OF LED LIGHTING AND MICROMETEOROLOGICAL ELEMENTS
Provedor de dados: 70
Autores: Rodrigues,Tatiana P. N. da S.; Pandorfi,Héliton; Guiselini,Cristiane; Almeida,Gledson L. P. de; Morrill,Waldirene B. B.
ABSTRACT The objective of this research was to analyze the differences between the food behaviors observed under the factors of production environment, sex and lighting system, using stochastic tools of multivariate analysis. As for the thermal characteristics of the environment, air temperature (T, °C), enthalpy (H, kJ kg-1), and black globe temperature and humidity index (BGTHI) showed high positive correlation with each other and strong negative correlation with relative humidity (RH, %). The “male drinking” behavior was positively associated with thermal characteristics of the environment in the three periods of the day, that is, the act of drinking more water would be a way to alleviate thermal stress. Birds subjected to red LED showed a strong...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Broiler farming; Lighting system; Principal component analysis; Thermal comfort.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300272

Broiler breeder hen performance and egg hatchability during rainy season in Brazilian semi-arid region
Provedor de dados: 70
Autores: Furtado,Dermeval A.; Tota,Laura D. C. A.; Nascimento,José W. B.; Guimarães,Mércia C. da C.; Lopes Neto,José P.
Henhouse thermal comfort and bird age influence broiler breeder hen productivity; this way, the present research aimed to assess thermal comfort indexes and broiler breeder hen performance during winter in North East semi-arid region from Brazil, using a Cobb Avian 48 broiler strain at the age of 38 and 50 weeks. We measured the following bioclimatic indexes: air temperature and relative humidity, black globe temperature and humidity, CO2 concentration and sound pressure levels at henhouse facility. Data analysis design was complete randomized in a 3 x 3 factorial scheme with three treatments (months) and three replications (week number of collection by month). A number of 25 climatic data were observed. Bioclimatic indexes at the most warm hours...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ambience; Thermal comfort; Egg-laying; Noise.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300001

PERFORMANCE AND WELFARE OF FINISHING PIGS SUBJECTED TO CLIMATECONTROLLED ENVIRONMENTS AND SUPPLEMENTARY LIGHTING
Provedor de dados: 70
Autores: Barnabé,Janice M. C.; Pandorfi,Héliton; Gomes,Nicoly F.; Ameida,Gledson L. P. de; Guiselini,Cristiane.
ABSTRACT An adequate thermal environment in pig farming facilities is essential to ensure productivity and animal welfare. The objective of this study was to evaluate the behavior and performance of finishing pigs, subjected to climate-controlled environments and supplementary lighting. Twenty-seven pigs (3/4 Duroc, 1/4 Pietrain) were kept in pens with no climate control, pens with forced ventilation and pens with adiabatic evaporative cooling system, 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 3x3 factorial arrangement and the means were compared by Tukey test (p&lt;0.05). Meteorological variables,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal ambience; Behavior; Thermal comfort; Weight gain.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300294

ENVIRONMENTAL THERMAL COMFORT OF A REDUCED MODEL USING CROSS-LAMINATED TIMBER
Provedor de dados: 70
Autores: Sampaio,Carlos A. de P.; Terezo,Rodrigo F.; Motta,Guilherme; Silva,Leonardo M. da C.; Vassem Júnior,Ilson.
ABSTRACT The challenges for the use of the cross-laminated timber (CLT) system in the Brazilian agricultural market are significant. This study evaluated the thermal performance of fiber cement tiles associated with a CLT non-conventional structure compared to those of ceramic, fiber cement and aluminum roof tiles based on following thermal comfort indexes (i.e., black globe humidity index (BGHI), radiant heat load (RHL) and specific enthalpy) using physical conventional models of reduced-scale rural facilities under summer conditions. The non-conventional CLT model comprised closing walls and a lining that form a self-supporting structure with few air inlets. This model presented reduced thermal comfort indexes compared to the other conventional roofs....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precasting in wood; Self-supporting; Thermal comfort; Environmental factors.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400413

Low cost driver device for microclimate maintenance in the pre-milking of dairy cattle
Provedor de dados: 70
Autores: Silva,Irenilson M. da; Pandorfi,Héliton; Vasconcelos,Ângelo J. S. de; Laurenti,Renato; Guiselini,Cristiane.
Due to the importance of the environment on animal production and thus environmental control, the study aims to build a system for monitoring and control the meteorological variables, temperature and relative humidity, low cost, which can be associated with an evaporative cooling system (ECS). The system development included all the stages of assembly, test and laboratory calibration, and later the validation of the equipment carried in the field. The validation step showed results which allowed concluding that the system can be safely used in the monitoring of these variables. The controller was efficient in management of the microclimate in the waiting corral and allowed the maintenance of the air temperature within the comfort range for dairy cattle in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cattle; Thermal comfort; Instrumentation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100001

Internal ambience of bee colonies submitted to strengthening management by adding broods
Provedor de dados: 70
Autores: Brasil,Daniel de F.; Guimarães,Michelle de O.; Barbosa Filho,José Antonio D.; Freitas,Breno M.
This study aimed to investigate the ideal brood area to be introduced for strengthening Apis mellifera colonies, considering variations in the hive's internal ambience. Therefore, eight colonies were equipped with data loggers for recording variations in temperature and humidity inside the hives. Then, these colonies were split in four treatments involving the swapping of four, three, two and one brood comb between strong and weak colonies. Growth in the amount of brood and food stores to the four colony strengthening treatments was assessed counting the comb cells to record changes in the brood and food area. The colonies tended to restore their normal thermoregulation within four hours after they had been manipulated and the hive cover had been closed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colony homeostasis; Thermal comfort; Colony management.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500002

USING SOUNDS PRODUCED BY PIGS TO IDENTIFY THERMONEUTRALITY ZONES FOR THERMAL ENVIRONMENT ASSESSMENT RATIOS
Provedor de dados: 70
Autores: Amaral,Pedro I. S.; Campos,Alessandro T.; Yanagi Junior,Tadayuki; Cecchin,Daiane; Leite,Evandro M.; Dias e Silva,Nhayandra C.
ABSTRACT Although dry bulb temperature (T) is the environmental variable most commonly used to classify thermal comfort in pigs, environmental assessment ratios provide more accurate information. The objective of this study was to correlate the sound pressure levels (SPL) produced by piglet vocalization with the thermal environment observed during the nursery phase, and subsequently establish thermoneutrality ranges. The experiment was conducted on a pig farm where T, relative humidity (RH), and SPL data were recorded between 9 am-5 pm for 42 days. The association between SPL and T in nursery phase piglets was verified; for thermal comfort to be possible, SPLs were 56.3 to 60.3 dB. The SPLs were subsequently used in predictor equations of ratios, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ambience; Animal welfare; Nursery; Rearing; Thermal comfort.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000300266

SOWS AND PIGLETS THERMAL COMFORT: A COMPARATIVE STUDY OF THE TILES USED IN THE FARROWING HOUSING
Provedor de dados: 70
Autores: Machado,Sivanilza T.; Nääs,Irenilza De A.; Reis,João G. M. Dos; Caldara,Fabiana R.; Santos,Rodrigo C.
ABSTRACT The global animal production is increasing as expected to meet world demand for food, especially for meat products. This research aimed to investigate the effect of two types of roofs (clay and fiber-cement tiles) in a tropical area on the thermal comfort of farrowing sows and piglets. Twelve sows and forty-eight piglets were observed during summer in the Southeast region of Brazil. Climate variables, thermal comfort and surface temperature (sows and piglets) were assessed. The type of roofs clearly affected the piglets' surface temperature during all studied periods, but the results were not similar in the sows' surface temperature. Temperature and humidity index found was high in the building with fiber-cement tiles. The pen location in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pig production; Roof material; Surface temperature; Thermal comfort; Tropical conditions.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000600996

Internal ambience of beehives Apis mellifera with different colors and roofing materials in the sub middle of the São Francisco Valley
Provedor de dados: 70
Autores: Souza,Maria de F. P; Turco,Silvia H. N.; Silva,Eva M. S; Costa,Daniel dos S; Freire,Murilo S.
ABSTRACT The current study aimed to evaluate the influence of three colors and two types of roofing materials under the internal temperature of bee colonies Apis mellifera. The experiment was conducted at the Agricultural Sciences Campus at the Federal University of Sao Francisco Valley located in Petrolina-PE, in November and December 2013, using 24 colonies housed in Langstroth hives. The experiment was a completely randomized factorial design (3x2) with three colors of box (blue, white, and traditional) and two types of cover (with and without the use of plaster) with six treatments and four replications. The internal temperature dates of the colonies were hourly recorded, during 24 hours, and surface temperatures were hourly recorded between 08h00 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Insects; Temperature.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000400625

Computational Fluid Dynamics (CFD) simulating heated air from wood burning inside a poultries barn
Provedor de dados: 70
Autores: Coradi,Paulo C.; Martins,Márcio A.; da Costa,Douglas R.; Vigoderis,Ricardo B.; Tinôco,Ilda de F. F.
ABSTRACT Animal welfare is essential for livestock yield gains, which has been ethically justifiable and socially acceptable. Thus, our research aimed to test computational fluid dynamics model (CFD) to simulate heated air within a poultry barn. Data were simulated in CFD software based on Navier-Stokes equations (geometry of 3 m x 6 m, considering a symmetric mesh). As boundary conditions, a temperature of 38ºC was considered for walls where heating pipe outlets are, to the west side, besides a heat flow of zero, in symmetry to the same side. As for the sides east, south and north, walls were taken as isolated, i.e. heat flow equals to zero. The aviary heating system did not achieve a homogeneous temperature distribution, heat flow, heated air pressure...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environment; Animals; Thermal comfort; Airflow.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500768

Benefits of automated acclimatization during the pre-milking phase of lactating girolando cows
Provedor de dados: 70
Autores: Silva,Irenilson M. da; Pandorfi,Héliton; Almeida,Gledson L. P.; Guiselini,Cristiane; Henrique,Hugo M.
The aim of this paper was to evaluate the automated acclimatization effects during pre-milking of cows on thermal conditioning, physiology, milk production and cost-benefit of the automated adiabatic evaporative cooling system (AECS). The treatments 20; 30; 40 min and control consisted of exposure time of pre-milking cows to the automated AECS. Sixteen cows were used with an average daily milk yield of 19 kg, distributed in a 4 x 4 Latin square design. The Tukey's test (P&lt;0.05) was used to compare the means. The environmental variables, dry bulb temperature (DBT, ºC) and relative humidity (RH, %), were recorded every minute, which allowed the determination of the system efficiency through the Temperature and Humidity Index (THI). The respiratory rate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Automation; Dairy cattle; Evaporative cooling system.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000500002

COMPUTATIONAL FLUID DYNAMICS (CFD) APPLICATION FOR VENTILATION STUDIES IN BROILER HOUSES
Provedor de dados: 70
Autores: Curi,Thayla M. R. de C.; Moura,Daniella J. de; Massari,Juliana M.; Mesquita,Márcio; Pereira,Danilo F.
ABSTRACT With the recent increase in the number of acclimatized broiler houses in Brazil, design and adaptation of facilities to withstand the tropical weather conditions enabling the maintenance of ideal conditions without increasing costs have been major challenges. The aim of this study was to evaluate the ventilation system in solid-wall broiler houses using computational fluid dynamics (CFD). The research was carried out in the city of Amparo - SP (Brazil). The facility consisted of a broiler house enclosed by masonry sidewalls with tunnel ventilation equipped with exhaust fans (air outlet) and cooling pads (air inlet). The following variables were collected: wind speed and dry bulb temperature over 27 equidistant points inside the house at bird...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler house; Computational modeling; Environmental control; Poultry; Thermal comfort.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100001

Evaluation of the heating of broilers in shed by means of gas hoods and underfloor heating
Provedor de dados: 70
Autores: Leva,Flávia F. de; Camacho,José R.; Oliveira Filho,Delly.
This study was conducted to evaluate and compare the behavior of the heating inside poultry shed through gas hood and underfloor heating. The experiment was conducted in poultry shed belonging to the Federal Institute of Education, Science and Technology of Triângulo Mineiro Region, Uberlândia city Â– state of Minas Gerais (MG), Brazil. The dimensions of the shed are 24 meters long and 9.6 meters wide and with a ceiling height of 3.2 meters. The temperature was measured with an optical thermometer of Minipa brand, MT 350 model. It was used, to the analysis of temperature behavior, the public domain software FEMM 4.2, which uses finite elements techniques, with data collected from two lots. Underfloor heating is made using hot water flowing through a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy consumption; Underfloor heating; Environment; Thermal comfort; Solar energy.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400023

Adjust of regression models to estimate the rectal temperature of broilers for the first 14 days of life
Provedor de dados: 70
Autores: Ponciano,Patrícia F.; Yanagi Junior,Tadayuki; Lima,Renato R. de; Schiassi,Leonardo; Teixeira,Vitor H.
The broiler rectal temperature (t rectal) is one of the most important physiological responses to classify the animal thermal comfort. Therefore, the aim of this study was to adjust regression models in order to predict the rectal temperature (t rectal) of broiler chickens under different thermal conditions based on age (A) and a meteorological variable (air temperature - t air) or a thermal comfort index (temperature and humidity index -THI or black globe humidity index - BGHI) or a physical quantity enthalpy (H). In addition, through the inversion of these models and the expected t rectal intervals for each age, the comfort limits of t air, THI, BGHI and H for the chicks in the heating phase were determined, aiding in the validation of the equations and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal environment; Poultry; Thermal comfort; Mathematical modeling; Physiological responses.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100002

Determination of thermal comfort zone for early-stage broilers
Provedor de dados: 70
Autores: Cândido,Márcia G. L.; Tinôco,Ilda De F. F.; Pinto,Francisco de A. de C.; Santos,Nerilson T.; Roberti,Ricardo P.
ABSTRACT Environmental temperatures currently considered within comfort zone for broiler rearing may be misleading or even obsolete from actual values. Some factors such as animal genetics, nutrition and poultry management, mainly acclimatization to tropical and subtropical conditions, influence in determining the comfort zone for birds. This study aimed to evaluate the effects of five different thermal environments on animal welfare and rearing performance of broiler chickens, setting an ideal temperature range (comfort zone) for each of the first three weeks of poultry breeding. The chicks (375) were randomly placed into five climatic chambers set to distinct thermal conditions, being: one as recommended by the literature, another as stated by Cassuce...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry; Thermal comfort; Animal performance; Cold stress.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500760

CLOACAL AND SURFACE TEMPERATURES OF BROILERS SUBJECT TO THERMAL STRESS
Provedor de dados: 70
Autores: Abreu,Lucas H. P.; Yanagi Junior,Tadayuki; Campos,Alessandro T.; Bahuti,Marcelo; Fassani,Édison J.
ABSTRACT: The cloacal and surface temperatures are important physiological parameters to quantify the thermal comfort of animals, its variations may occur as a function of thermal variables. In this context, the goal of the present study was to evaluate the cloacal (tclo) and surface (tsur) temperatures of Cobb 500® broilers, in the second week of life, subjected to different air dry-bulb temperature (24, 27, 30 and 33 °C) and stress durations (1, 2, 3 and 4 days). The experiment was carried out in four climate-controlled wind tunnels. Air relative humidity and air velocity were set at 60% and 0.2 m s-1, respectively. The tclo and tsur were measured daily through digital thermometer and thermographic camera, respectively. Analysis of variance and Scott...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal environment; Aviculture; Thermal comfort; Thermographic image; Physiologic parameters.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500877

HYSTERESIS AND THERMAL INERTIA OF SPHERES OF ALTERNATIVE MATERIALS FOR BLACK GLOBE THERMOMETERS
Provedor de dados: 70
Autores: Sampaio,Carlos A. de P.; Terezo,Rodrigo F.; Vassem Júnior,Ilson; Silva,Leonardo M. da C.; Borges,Luiza K.
ABSTRACT This research was conducted with the objective of evaluating the thermal inertia and hysteresis of the following materials in a wind tunnel: hollow copper sphere with 150.0 mm diameter used as standard in globe thermometers, hollow brass sphere with 75.0 mm diameter, and two hollow plastic spheres with 115.5 and 69.7 mm diameter. The results showed that the thermal inertia and hysteresis for the hollow copper sphere were approximately 24 and 28 min, respectively; these values were bigger than those obtained for the other spheres, implying faster responses of these. While there were no statistical differences in the measurements conducted by globe thermometers which are used to indicate the black globe temperature with the different types of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Instrumentation; Thermal properties; Radiant temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000500567

Thermal performance and concentration of gases in facilities for pigs in semiarid region from State of Paraiba - Brazil
Provedor de dados: 70
Autores: Furtado,Dermeval A.; Amancio,Daniele; Nascimento,José W. B. do; Gomes,Josivanda P.; Silva,Rafael C.
The study was conducted in a facility for pigs during the nursery and finishing in the town of 'Montadas', in the semiarid of the state of Paraiba, Brazil, in the rainy and dry season, aiming to evaluate the concentration of oxygen, methane, carbon monoxide and ammonia, and the bioclimatic indexes: ambient temperature (AT), relative humidity (RH) and the index of black globe temperature and humidity (IBGTH). These indexes differed significantly (P&gt;0.05) between the periods and times. The AT in the rainy season was in the thermal comfort zone(TCZ) in most of the times in the nursery; for the finishing phase, thermal discomfort occurred; during the dry season, there was thermal comfort in the nursery phase; in the finishing phase the thermal discomfort...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Welfare; Thermal comfort; Gases; Semiarid.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100004

LOW COST FUZZY SYSTEM APPLIED TO THE CONTROL AND SUPERVISION OF THERMAL ENVIRONMENT IN POULTRY FARMS
Provedor de dados: 70
Autores: Alecrim,Paulo D. de; Campos,Alessandro T.; Yanagi Junior,Tadayuki; Ferreira,Jacqueline C.; Trindade,Alander A.
ABSTRACT The aim of this study was to develop an automated fuzzy controller with microcontroller, consisting of hardware and software for the control and supervision of thermal environment in broiler farms. The study has been conducted in two steps: in the first one it was performed a computer analysis through simulation. In the second step it was performed the evaluation of the software and hardware developed by the equipment test in the registration of the thermal environment variables within the facility and activation of the climate control equipment. The experiment was conducted in a poultry house with broilers of Cobb 500 lineage, aged between 1 and 28 days in an experimental farm located in Bambuí - MG. The presented prototype is able to operate in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry environment; Thermal comfort; Fuzzy controller; Ventilation system equipment for broiler houses.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100194

THERMAL EFFICIENCY OF DIFFERENT COVERAGE MATERIALS IN REDUCED MODELS OF ANIMAL HUSBANDRY FACILITIES: A CASE STUDY
Provedor de dados: 70
Autores: Castro,Ariane C. de; Silva,Iran J. O. da; Nazareno,Aérica C.; Nunes,Maria L. A.; Piedade,Sônia M. de S.
ABSTRACT This study aimed to assess different combinations of coverage materials in reduced models of animal husbandry facilities based on thermal comfort indices. It was conducted in an experimental area of the Research Center in Ambience located in São Paulo State, Brazil (22°42′30″ S and 47°38′00″ W). The performance of ceramic and fiber-cement (white painted) tiles was assessed associated with two types of polypropylene commercial linings (lining A and B) installed below the roof, and a thermo-reflective screen (lining C) installed above the fiber-cement roof. Microclimatic assessment of distorted reduced-scale models was performed at 15-minute intervals by registering the air temperature, black globe temperature, relative humidity and air velocity....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ambience; Thermal comfort; Tiles; Poultry facility; Linings.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300403

Energy balance in the poultry-shed system and its influence on broiler performance
Provedor de dados: 70
Autores: Silva,Tatiana P. N. da; Pandorfi,Héliton; Guiselini,Cristiane.
ABSTRACT The objective of this study was to determine the energy balance of the poultry-shed system and its effect on broiler performance during the production cycle. The experimental design was completely random with sub-divided blocks. The blocks were composed of five different types of sheds and the sub-blocks of the evaluation times (00:00 h to 23:00 h), allowing an analysis of variance and a comparison between means with the Tukey test. There were no significant differences between the mean values of the exchanges of sensible, latent and total heat between the poultry sheds but the differences for the evaluation times were significant (P&lt;0.05). There was no significant difference between sheds 1 and 4 for broiler productive performance regarding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler industry; Thermal comfort; Thermography.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000400613

Predicting chick body mass by artificial intelligence-based models
Provedor de dados: 86
Autores: Ferraz,Patricia Ferreira Ponciano; Yanagi Junior,Tadayuki; Hernández Julio,Yamid Fabián; Castro,Jaqueline de Oliveira; Gates,Richard Stephen; Reis,Gregory Murad; Campos,Alessandro Torres.
The objective of this work was to develop, validate, and compare 190 artificial intelligence-based models for predicting the body mass of chicks from 2 to 21 days of age subjected to different duration and intensities of thermal challenge. The experiment was conducted inside four climate-controlled wind tunnels using 210 chicks. A database containing 840 datasets (from 2 to 21-day-old chicks) - with the variables dry-bulb air temperature, duration of thermal stress (days), chick age (days), and the daily body mass of chicks - was used for network training, validation, and tests of models based on artificial neural networks (ANNs) and neuro-fuzzy networks (NFNs). The ANNs were most accurate in predicting the body mass of chicks from 2 to 21 days of age...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Artificial neural network; Broiler; Modeling; Neuro-fuzzy network; Thermal comfort.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000700559

Assessment of broiler surface temperature variation when exposed to different air temperatures
Provedor de dados: 89
Autores: Nascimento,GR; Nääs,IA; Pereira,DF; Baracho,MS; Garcia,R.
This study was conducted to determine the effect of the air temperature variation on the mean surface temperature (MST) of 7- to 35-day-old broiler chickens using infrared thermometry to estimate MST, and to study surface temperature variation of the wings, head, legs, back and comb as affected by air temperature and broiler age. One hundred Cobb® broilers were used in the experiment. Starting on day 7, 10 birds were weekly selected at random, housed in an environmental chamber and reared under three distinct temperatures (18, 25 and 32 ºC) to record their thermal profile using an infrared thermal camera. The recorded images were processed to estimate MST by selecting the whole area of the bird within the picture and comparing it with the values obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Image analysis; Poultry; Thermal comfort.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000400007

Evaluation of recycled tiles and OSB ceiling materials in closed broiler house prototypes
Provedor de dados: 89
Autores: Cravo,JCM; Fiorelli,J; Lahr,FAR; Fonseca,R da; Cruz,VC da.
This study aimed at evaluating the thermal performance of a modular ceiling system for poultry houses. The reduced- and distorted-scale prototypes used ceiling modules made of reforested wood and were covered with recycled long-life package tiles. The following parameters were measured for 21 days: tile internal surface temperature (ST), globe temperature and humidity index (WBGT), and radiant heat load (RHL). Measurements were made at times of highest heat load (11:00 am, 13:00 pm, and 03:00 pm). Collected data were analyzed by "R" statistics software. Means were compared by multiple comparison test (Tukey) and linear regression was performed, both at 5% significance level. The results showed that the prototype with the ceiling was more efficient to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler house environment; Recycled tiles; Thermal comfort.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2009000400002

Estimating mortality in laying hens as the environmental temperature increases
Provedor de dados: 89
Autores: Pereira,DF; do Vale,MM; Zevolli,BR; Salgado,DD.
Layer mortality due to heat stress is an important economic loss for the producer. The aim of this study was to determine the mortality pattern of layers reared in the region of Bastos, SP, Brazil, according to external environment and bird age. Data mining technique were used based on monthly mortality records of hens in production, 135 poultry houses, from January 2004 to August 2008. The external environment was characterized according maximum and minimum temperatures, obtained monthly at the meteorological station CATI in the city of Tupã, SP, Brazil. Mortality was classified as normal (£ 1.2%) or high (&gt; 1.2%), considering the mortality limits mentioned in literature. Data mining technique produced a decision tree with nine levels and 23 leaves,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Data mining; Layer production; Mortality; Thermal comfort.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000400008

Turkey Wattle Temperature Response to Distinct Environmental Factors
Provedor de dados: 89
Autores: Mendes,AS; Moura,DJ; Morello,GM; Carvalho,TMR; Sikorski,RR.
ABSTRACT Rearing environmental conditions are important for turkey production, because this bird is particularly sensitive to heat stress. This study aimed at measuring the wattle temperature response of turkeys of three different ages (61, 96, and 131 days old) exposed to different combinations of dry bulb temperature, relative humidity, and wind speed ranges, as an indication of their physiological responses. The experiment was conducted with 42 male birds housed in a controlled environment chamber and exposed to different combinations of two air speed (WS) ranges (WS1 = 0.3-0.6 ms-1, considered low, and WS2 = 1.2-1.6 ms-1, considered high), dry bulb temperature (DBT) between 22 and 34 °C, and relative humidity (RH) between 40 to 90 %. The statistical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wind speed; Thermal comfort; Relative humidity; Environmental exposure.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400439

Minimum ventilation systems and their effects on the initial stage of turkey production
Provedor de dados: 89
Autores: Mendes,AS; Moura,DJ; Nääs,IA; Morello,GM; Carvalho,TMR; Refatti,R; Paixão,SJ.
This study aimed at evaluating the live performance of turkeys during the initial stage of production (1-26 days of age) and to map the environmental variables inside turkey houses, such as temperature, relative humidity, CO2 concentration, at two distinct minimum ventilation systems. House 1 (H1) was equipped with a negative-pressure ventilation system and House 2 (H2) was equipped with a positive-pressure ventilation system. This study was performed in commercial poultry houses, located in Francisco Beltrão, Paraná, Brazil, in June, 2008. A number of 14,000 turkeys toms at the same age, provided by the same local hatchery and were housed at a stocking density of 23 birds m-2. Three 13 m² boxes with 300 turkeys each were placed inside the poultry houses....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air renewal; Gases; Poultry house; Thermal comfort.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000100002

Effect of floor type (dirt or concrete) on litter quality, house environmental conditions, and performance of broilers
Provedor de dados: 89
Autores: Abreu,VMN; Abreu,PG de; Jaenisch,FRF; Coldebella,A; Paiva,DP de.
This study was conducted with the objective of evaluating the use of concrete or hard-packed dirt floor in broiler houses. This experiment was carried out in two different phases. The following performance parameters were studied: live weight, feed intake, feed conversion ratio, and mortality. Litter moisture, pH and temperature were measured. Litter residual contamination after cleaning and disinfection was also evaluated. A dry bulb thermometer, a wet bulb thermometer, and a black bulb thermometer were placed inside each broiler house at bird height and outside the broiler house for data collection. Environmental data were collected at 3h intervals from 00:00 to 24:00 hours during weeks 4, 5, and 6 of the grow-out. Based on the collected data, air...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coliforms; Litter pH; Litter temperature; Live performance; Thermal comfort.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000200007

Performance of free-range chickens reared in production modules enriched with shade net and perches
Provedor de dados: 89
Autores: Santos,MJB; Pandorfi,H; Rabello,CBV; Silva,EP; Torres,TR; Santos,PA; Morril,WB; Duarte,NM.
An experiment was carried out to evaluate the effect of environmental enrichment in a free-range chicken production system on live performance as a function of microclimate, physiological parameters, and performance parameters. Four production modules were divided into four pens with 10 birds each, totaling 60 birds. The following treatments were applied: access to a paddock (TEST), access to a paddock with perches (PER), access to a paddock with artificial shade (SHA), and access to the paddock with perches and artificial shade (PESH). The PESH production module presented the best globe temperature (Tbg,ºC) and enthalpy (h, kJ/kg), and thereby, the best thermal environmental conditions, which ensured the longest permanence time of the birds in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal behavior; Physiological parameters; Poultry production; Thermal comfort.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000100003

One day-old chicks transport: Assessment of thermal profile in a tropical region
Provedor de dados: 91
Autores: Nazareno,Aérica C.; Silva,Iran J. O. da; Vieira,Frederico M. C.; Santos,Rofson F. S.
The aim of this study was to assess the thermal profile of truck with different levels of box placement during one day-old chicks transport. An experiment was conducted through monitoring of 11 transport loads. A acclimatized truck was used in this research, with maximum capacity of 630 one day-old chicks boxes, totalizing 63,000 animals. The assessment of thermal environment was performed in 5 min intervals, through the following variables: temperature, relative humidity and specific enthalpy. The treatments were registered at two levels of the load (first rack and floor) where 17 data loggers were distributed throughout the truck. The experiment used a completely randomized design and geostatistics was used for spatial dependency and Kriging...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry production; Thermal comfort; Live load; Day-old chicken; Animal transportation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000700663

Welfare and spatial distribution of noise levels in swine nursery
Provedor de dados: 91
Autores: Damasceno,Flavio A.; Oliveira,Carlos E. A.; Ferraz,Gabriel A. e S.; Nascimento,João A. C. do; Saraz,Jairo A. O.; Brandão,Leidimar F.
ABSTRACT The aim of this study was to evaluate the welfare and spatial distribution of noise levels in a swine nursery during the first three weeks of animal’s life. The climatic conditions were evaluated through the dry-bulb temperature (Tdb), relative humidity (RH) and black globe temperature and humidity index (BGHI) and allowed us to observe that the heating system influenced the conditions in the environment, and the use of the air conditioning system did not guarantee animal’s comfort conditions. The analysis on the spatial distribution of noise levels was performed using geostatistics and demonstrated the occurrence of spatial variability inside the facilities. The highest frequencies of noise levels were concentrated between 60 and 70 dB, and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pig farming; Thermal comfort; Sound pressure; Spatial variability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300196

Spatial variability of air temperature in a free-stall in the Northeastern semi-arid region of Brazil
Provedor de dados: 91
Autores: Gonçalves,Indira C. M.; Turco,Silvia H. N.; Ramos,Clóvis M. C.
ABSTRACT The knowledge on the spatial variability of climatic attributes and the building of Kriging maps can assist in the design and management of confined animal facilities, by allowing a spatial visualization that is helpful for the planning and control of information from the production environment. The study aimed to characterize the spatial variability of air temperature in a free-stall barn used for dairy cattle confinement located in Petrolina-PE, Brazil, in different seasons and at different times. The variable air temperature was recorded at 136 points distributed in the areas under the shed and the shade cloth for the study of spatial variability and the construction of maps by Kriging. Air temperature data was collected in the winter and in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cattle; Thermal comfort; Geostatistics; Animal production systems; Precision animal production.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000100067

Thermal environment in two broiler barns during the first three weeks of age
Provedor de dados: 91
Autores: H.,Robinson Osorio; Tinoco,Ilda F. F.; Osorio S,Jairo A.; Mendes,Luciano B.; Rocha,Keller S. O.; G.,Lina M. Guerra.
ABSTRACT The objective of this research was to evaluate the internal thermal environment of two broiler barns featuring different ventilation systems representative of Brazilian and South American poultry production industry: (a) a negative-pressure tunnel and (b) a positive-pressure lateral ventilation system. Environmental parameters such as dry bulb temperature, relative humidity and temperature-humidity index were assessed; temperature maps for day and night average conditions were determined for the first three weeks of life. Better uniformity of the thermal environment and comfort conditions inside the negative-pressure tunnel were found.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Poultry production; Bioclimatic conditions.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000300256

Spatial variability of enthalpy in broiler house during the heating phase
Provedor de dados: 91
Autores: Ferraz,Patrícia F. P.; Yanagi Junior,Tadayuki; Ferraz,Gabriel A. e S.; Schiassi,Leonardo; Campos,Alessandro T.
ABSTRACT The thermal environment inside a broiler house has a great influence on animal welfare and productivity during the production phase. Enthalpy is a thermodynamic property that has been proposed to evaluate the internal broiler house environment, for being an indicator of the amount of energy contained in a mixture of water vapor and dry air. Therefore, this study aimed to characterize the spatial variability of enthalpy in a broiler house during the heating phase using geostatistics. The experiment was conducted in the spring season, in a commercial broiler house with heating system consisting of two furnaces that heat the air indirectly, in the first 14 days of the birds' life. It was possible to characterize enthalpy variability using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry farming; Thermal comfort; Geostatistics; Kriging; Chicks.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000600570

Diagnosis and validation by computational fluid dynamics of poultry house with negative pressure ventilation
Provedor de dados: 91
Autores: Cunha,Gisele C. de A.; Lopes Neto,José P.; Furtado,Dermeval A.; Borges,Valéria P.; Freire,Elias A.; Nascimento,José W. B. do.
ABSTRACT Negative pressure ventilation in poultry houses has been used to enable the correction of their internal microclimates, and studies point to the heterogeneous distribution of air along the aviaries and the inadequacy of the environmental variables to the recommended ranges for thermal comfort of adult birds, especially in the hottest hours of the day. This study aimed to diagnose the facilities of a poultry house in the state of Paraíba, Brazil, regarding the distribution of environmental variables and thermal comfort; develop a computational model and validate it for Computational Fluid Dynamic - CFD simulations. Air temperature (Tair), air relative humidity (RH) and air velocity (Vair) data allowed characterizing the internal environment by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Thermal index; Simulations.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001000761

Physiological parameters for thermal stress in dairy cattle
Provedor de dados: 96
Autores: Dalcin,Vanessa Calderaro; Fischer,Vivian; Daltro,Darlene dos Santos; Alfonzo,Evelyn Priscila München; Stumpf,Marcelo Tempel; Kolling,Giovani Jacob; Silva,Marcos Vinícius Gualberto Barbosa da; McManus,Concepta.
ABSTRACT The objective of this study was to investigate changes in physiological parameters of dairy cows and understand which physiological parameters show greater reliability for verification of heat stress. Blood samples were collected for analysis and included hematocrit (Ht), erythrocyte count (ERY), and hemoglobin count (HEMO). In addition, physiological variables, including rectal temperature (RT), heart rate (HR), respiratory rate (RR), and panting score (PS) were recorded in 38 lactating cows. These varied according to genetic group (1/2, 3/4, and pure bred Holstein (HO)). Analysis of variance considering the effects of genetic group, days, and their interaction as well as linear and quadratic effect of the black globe humidity index (BGHI) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broken line; Critical values; Thermal comfort; Thermoregulation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000800458

Evaluation of reflective painting of the roof and artificial ventilation on performance and carcass yield of broilers
Provedor de dados: 96
Autores: Passini,Roberta; Araújo,Maria Angélica Gonçalves de; Almeida,Eduardo Alves de; Yasuda,Vinícius Melo.
This study was developed with the objective of evaluating reflective paint on covering and artificial ventilation on performance of broilers (males and females). A randomized design with a 2 × 2 × 2 factorial arrangement of treatments was used, as follows: 2 external management systems (coverage with and without reflective paint), 2 internal management systems (with and without artificial ventilation) and 2 sexes (male and female), totalizing 8 treatments. A total of 480 1-day old chicks of the Cobb strain were distributed randomly, according to sex, to treatments. Each treatment consisted of 4 pens - two pens for males and two for females - with 30 birds each. Six birds/pen were sampled. The studies were conducted at IFG-Urutaí Campus. For the performance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aviculture; Poultry environment; Thermal comfort.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700029

Infrared thermography as a method for evaluating the heat tolerance in dairy cows
Provedor de dados: 96
Autores: Daltro,Darlene dos Santos; Fischer,Vivian; Alfonzo,Evelyn Priscila München; Dalcin,Vanessa Calderaro; Stumpf,Marcelo Tempel; Kolling,Giovani Jacob; Silva,Marcos Vinícius Gualberto Barbosa da; McManus,Concepta.
ABSTRACT The objective of this study was to determine whether infrared thermography is a useful tool for the recognition of dairy cows in a state of thermal heat stress, as well as to identify the best region of the animal to be evaluated for this recognition. Physiological variables, including rectal temperature, respiratory frequency, cardiac frequency, and panting score were recorded in 38 lactating cows. For the assessment of environmental parameters, a digital black globe thermometer (TGD-200 model) was used. Thermographic photographs of different regions of the body of cows were taken using an infrared camera (FLIR® System T300) and indicated respective superficial temperature. Physiological variables and superficial body temperature in different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Dairy cattle; Thermal comfort; Thermographic images.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000500374

Microclimate in silvipastoral systems with eucalyptus in rank with different heights
Provedor de dados: 96
Autores: Souza,Wander de; Barbosa,Orlando Rus; Marques,Jair de Araújo; Costa,Marco Aurélio Teixeira; Gasparino,Eliane; Limberger,Erni.
The aim of this work was to verify if the presence of trees and its height in formed silvipastoral systems with eucalyptus planted in rank can modify the microclimate and improve the environment for bovine raising during the day in summer. It was evaluated the microclimate of the environment in formed silvipastoral systems in rank of eucalyptus with 8 m, 18 m and 28 meters of height, compared to a system no shade in the summer. The experimental design was a split plot with six hour time in sub parcels. The systems are made up of parcels and the months as block in four replications and the interaction hour × system. The air temperature, black globe temperature, relative humidity and wind speed were observed to create the following indexes for thermal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ambient; Heat stress; Index; Shade; Thermal comfort; Trees.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000300030

Bands of respiratory rate and cloacal temperature for different broiler chicken strains
Provedor de dados: 96
Autores: Nascimento,Sheila Tavares; Silva,Iran José Oliveira da; Mourão,Gerson Barreto; Castro,Ariane Cristina de.
The objective of this investigation was to estimate ideal bands of respiratory rate and cloacal temperature for broiler chicken strains during the rearing period and to evaluate the influence of time of exposure on bird physiological variables under different thermal stress conditions. The research was conducted in a climatic chamber during the six weeks of the rearing period, with Avian and Cobb strains exposed to two climatic conditions (comfort and stress), in three distinct times of exposure, in three conditions (before going to the chamber; at the end of exposure time; 30 minutes after the end of exposure), in four treatments: comfort with 60 minutes of exposure; stress with 30 minutes of exposure; stress with 60 minutes of exposure; stress with 90...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry; Physiological variables; Thermal comfort.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000500033

Broiler surface temperature distribution of 42 day old chickens
Provedor de dados: 63
Autores: Nääs,Irenilza de Alencar; Romanini,Carlos Eduardo Bites; Neves,Diego Pereira; Nascimento,Guilherme Rodrigues do; Vercellino,Rimena do Amaral.
Broiler chickens in Brazil are generally reared from 1 to 42 days when they are exposed to procedures such as fasting, harvesting, crating and transport to slaughter. Maintaining homeostasis is of great importance for broiler survival under harsh environment especially prior to slaughter. Heat loss varies in the distinct parts of the body during the growth period, and it is related to the air temperature of the environment and to the amount of feather covering. This research aimed to study the surface temperature distribution using infrared thermographic image processing to characterize 42 day old broiler chicken surface temperature prior to slaughter. Broilers were reared for 42 days and prior to harvest and transport to slaughter the infrared surface...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Heat loss; Thermoregulation; Infrared thermography.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500001

Thermal performance of sisal fiber-cement roofing tiles for rural constructions
Provedor de dados: 63
Autores: Tonoli,Gustavo Henrique Denzin; Santos,Sérgio Francisco dos; Rabi,José Antonio; Santos,Wilson Nunes dos; Savastano Junior,Holmer.
Roofing provides the main protection against direct solar radiation in animal housing. Appropriate thermal properties of roofing materials tend to improve the thermal comfort in the inner ambient. Nonasbestos fiber-cement roofing components reinforced with cellulose pulp from sisal (Agave sisalana) were produced by slurry and dewatering techniques, with an optional addition of polypropylene fibers. Nonasbestos tiles were evaluated and compared with commercially available asbestos-cement sheets and ceramic tiles (frequently chosen as roofing materials for animal housing). Thermal conductivity and thermal diffusivity of tiles were determined by the parallel hot-wire method, along with the evaluation of the downside surface temperature. Cement-based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulose pulp; Polypropylene fiber; Thermal comfort; Parallel hot-wire method; Thermal conductivity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100001

Perfomance of an evaporative cooling system of a finishing phase swine barn
Provedor de dados: 63
Autores: Sartor,Valmir; Baêta,Fernando da Costa; Tinôco,Ilda de Fátima Ferreira; Luz,Maira Luciana.
The thermal environment inside of a finishing phase swine barn has great influence on the success of swine production. This environment can be characterized by the black globe temperature and humidity index (BGHI), that represents the air temperature, humidity, wind speed and radiation. Due to the small number of Brazilian reports on this specific subject, this experiment was performed to verify the effect of one kind of evaporative cooling system on the thermal comfort of the animal in a swine barn, during the 98/99 summer at Patos de Minas, MG, Brazil. Two constructions were used, divided in 36 barns, each one with 15 animals, 110 to 150 days old. Along a side of one barn, four cooling devices were installed, with a ventilation system connected to a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ventilation; Thermal environment; Thermal comfort.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100003

Microclimate without shade and silvopastoral system during summer and winter - doi: 10.4025/actascianimsci.v35i1.15155
Provedor de dados: 2
Autores: Baliscei, Marcio Antonio; Instituto Paranaense de Assistência Técnica e Extensão Rural; Barbosa, Orlando Rus; Programa de Pós-Graduação em Zootecnia da Universidade Estadual de Maringá, Av. Colombo, 57020-900. Maringá Paraná Brasil; Souza, Wander de; Instituto Paranaense de Assistência Técnica e Extensão Rural; Costa, Marco Aurelio Teixeira; Universidade Estadual de Maringá; Krutzman, Alexandre; Universidade Estadual de Maringá; Queiroz, Edicarlos Oliveira; Universidade Estadual de Maringá,.
This study evaluated the microclimate in a system without shade (WS) and in a silvopastoral system (SP) with eucalyptus during summer and winter, by measuring the air temperature (Ta), black globe temperature (Tg), relative humidity (RH), wind speed (Ws), every 2 hours for 24 hours between rows, shade (SP) and no shade effect (WS). It was employed the randomized blocks design (months), in the plots (systems), subplots (hours) and sub-subplots (seasons). Except for Ta and RH, the Tg (24.73, 26.41ºC), Ws (3.16, 4.57 m s-1), Black globe-humidity index (BGHI) (71.83, 73.84), Thermal load index (TLI) (74.53, 76.11) and Radiant thermal load (RTL) (526.46, 595.80 W m-2), respectively for SP and WS, were higher in WS. Ta, RH and Ws had a quadratic effect of hour....
Tipo: Pesquisqa de campo
Palavras-chave: Thermal comfort; Seasons; Index; Silvopastoral; Shade thermal comfort; Seasons; Index; Silvopastoral; Shade.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/15155

Comportamento de ovinos da raça Santa Inês, de diferentes pelagens, em pastejo - doi: 10.4025/actascianimsci.v33i3.9974
Provedor de dados: 2
Autores: Santos, Merilene Maria dos; UFRPE; Azevedo, Marcílio de; UFRPE; Costa, Lígia Alexandrina Barros da; UFRPE; Silva Filho, Florisval Protásio da; UFRPE; Modesto, Elisa Cristina; UFRRJ; Lana, Ângela Maria Quintão; UFMG.
O objetivo deste experimento foi avaliar o comportamento de ovinos da raça Santa Inês, de diferentes pelagens em condições de pastejo. O delineamento experimental foi o inteiramente casualizado, com três cores de pelame (branco, castanho e preto), representando os tratamentos e 7 repetições, em um arranjo de parcela subdividida com cor do pelame na parcela e período na sub-parcela. As observações das variáveis analisadas foram realizadas em quatro períodos experimentais, onde cada período conteve três dias de observações comportamentais. Sendo as variáveis analisadas: tempo de pastejo, tempo de ruminação, tempo em ócio, outras atividades e bebendo água. As observações foram realizadas a cada 10 min., das 6 às 17h. Não houve interação significativa (p &gt;...
Tipo: Pesquisa de campo
Palavras-chave: 5.04.00.00-2 Adaptação; Clima; Conforto térmico; Etologia 5.04.01.00-9 Adaptation; Climate; Thermal comfort; Ethology.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/9974

TEMPERATURE-HUMIDITY INDEX AND THERMAL COMFORT OF BROILERS IN HUMID TROPICS.
Provedor de dados: 111
Autores: Omomowo, Oluwafemi Owodunni.
In improving broiler welfare and ensuring better productivity thermal comfort of broilers is of utmost interest. To estimate the thermal comfort of broilers, the THI model was developed using commonly available meteorological parameters, namely temperature and relative humidity. This research re-examined the model by using the Levenberg-Marquardt Algorithm (Excel Solver) based nonlinear regression model to reduce the error space and generate new model constants unique to Akure, South West, Nigeria. Physiological data (cloacal temperature and body weight) were collected for a period of 6 weeks from 50 broilers raised in a developed adaptive poultry housing. Environmental data on temperature and relative humidity were used to calibrate the THI of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Thermal comfort; Temperature Humidity Index; Cloacal Temperature; Temperature.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6425

Behaviour of cockatiels (Nymphicus hollandicus) at two temperatures in captivity
Provedor de dados: 45
Autores: Carvalho,T.S.G.; Zangeronimo,M.G.; Saad,C.E.P.; Alvarenga,R.R.; Assis,V.D.L.; Pereira,V.M.; Scalon,J.D.; Silva,J.P.
Behavioural studies with cockatiels (Nymphicus hollandicus) in captivity are scarce. Due to the need for appropriate management of these animals, this study was performed to examine the behaviour of cockatiels kept in captivity at two temperatures. Sixteen cockatiels were individually housed in cages (62cm high x 43cm long x 27cm wide) and fed with a commercial ration and seed mixture for psittacids. Water was provided ad libitum. The eight-day experiment was divided into two stages of four days each. In the first stage, the birds were kept at room temperature (25°C) with 70% relative humidity during 24 hours. In the next stage, they were kept at 35°C from 06:00 to 18:00h and 25°C from 18:00 to 06:00h, also at 70% relative humidity. The behaviour of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds; Psittaciformes; Parrot; Thermal comfort; Captivity; Animal welfare.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352015000601669

Natural ventilation and surface temperature distribution of piglet crate heated floors
Provedor de dados: 45
Autores: Mendes,A.S.; Moura,D.J.; Nääs,I.A.; Bender,J.R.
This research had the objective of evaluating the influence of the natural ventilation on the surface temperature distribution of heated crates. The research used six crates from a farrowing room in a commercial swine production farm located in the state of São Paulo, Brazil. Three crates were heated using a heat mat while the other three had the environment heated by incandescent light bulbs (200W) fixed on the lateral wall. The surface temperature of the crate's floor (1.55x0.55m) was registered in 36 points, distributed in 18 quadrants (0.26x0.18m) using an infrared thermometer in three different conditions of the room's natural ventilation: opened, semi-opened, and closed lateral curtain. The isotherms and the temperature distribution of the floor heat...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Air velocity; Farrowing; Swine.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000200025

Thermal stress related with mortality rates on broilers' preslaughter operations: a lairage time effect study
Provedor de dados: 65
Autores: Vieira,Frederico Márcio Corrêa; Silva,Iran José Oliveira da; Barbosa Filho,José Antonio Delfino; Vieira,Afrânio Márcio Corrêa; Rodrigues-Sarnighausen,Valéria Cristina; Garcia,Danilo de Brito.
Concerning the reduction of preslaughter death losses, high temperature and relative humidity in the tropics are the major concerns regarding broiler survival prior slaughtering. However, the relationship between different lairage times under controlled environment and the thermal condition outside the holding area is still unclear. Thus, the aim of this study was to compare different intervals of lairage time with different environmental temperature and relationship with poultry mortality rates. A study was conducted in a commercial poultry abattoir in the State of Sao Paulo, Brazil, in the year of 2006. The historical data set from 13,937 trucks, about broiler mortality during preslaughter operations, was given by the abattoir. Factors that influence the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Death on arrival; Poultry production; Thermal comfort; Slaughterhouse; Welfare.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000900025