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Broiler breeder behavior and egg production as function of environmental temperature
Provedor de dados: 89
Autores: Pereira,DF; Nääs,IA; Romanini,CEB; Salgado,DD; Pereira,GOT.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder; Heat stress; Behavioral pattern.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000100002

Overview on the performance of Brazilian broilers (1990 to 2009)
Provedor de dados: 89
Autores: Patricio,IS; Mendes,AA; Ramos,AA; Pereira,DF.
This article describes the genetic evolution of commercial broilers between 1990 and 2009, considering live performance, in particular, in terms of weight gain and feed conversion ratio. In order to determine if the assumption that the relationship between body weight gain and feed conversion ratio is increasing and positive, information on all broiler strains reared in Brazil were collected from several companies present in five Brazilian regions. This survey aimed at evaluating broiler live performance as a function of genetic improvement with time. Broiler performance improved, as shown by the statistical differences obtained for the following parameters: livability, live weight, daily weight gain, feed conversion ratio, and production efficiency index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry production; Production efficiency; Genetics; Livability.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000400001

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

Animal welfare concepts and strategy for poultry production: a review
Provedor de dados: 89
Autores: Moura,DJ; Nääs,IA; Pereira,DF; Silva,RBTR; Camargo,GA.
Well being of animals had been historically a public concern, since the beginning of human kind history. As world's population grows there is a need for food including meat. In the last decades there has been a great improvement in poultry production based on the careful control of several aspects, among which nutrition and management (environment, health and rearing systems). Nowadays, the search for good welfare conditions is a global tendency in animal production; however issues surrounding farm animal welfare or well-being, such as definitions, measurements, interpretation, and perception, continue to be controversial. It is known that the result of a broiler not adequately housed is a direct loss in production which leads towards a thought that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bird welfare; Housing; Behavioral pattern; Welfare assessment.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000300001

Influence of a Commercial Hatchery Thermal Environmental on the Heat Loss of Fertile Broiler Eggs
Provedor de dados: 89
Autores: Silva,GF; Pereira,DF; Salgado,DD.
ABSTRACT The objectives of this study were to monitor the thermal environment of different hatchery locations during the transfer of fertile eggs from the setter and to the hatcher, to measure egg heat loss, and to determine its effects on hatchery results. In total, 1,728 fertile eggs of Cobb broiler breeders were divided into two treatments. In treatment 1 (T1), after 19 days of incubation, eggs were removed from the incubator and transferred to the hatcher in aninsulated box, and in treatment 0 (T0), eggs were transferred with no thermal insulation (T0). The duration of egg transfer was 10 minutes. Eggs were photographed using a thermographic camera at the exit of the setter, arrival at and exit from the candling room, and arrival at the hatcher. Based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermographic image; Thermal insulation; Egg transfer.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000600033

Climate Change in Layer Poultry Farming: Impact of Heat Waves in Region of Bastos, Brazil
Provedor de dados: 89
Autores: Lamarca,DSF; Pereira,DF; Magalhães,MM; Salgado,DD.
ABSTRACT The region around the municipality of Bastos, state of São Paulo, accounted for about 7% of Brazilian egg production in 2015. In 2012, it experienced a heat wave that resulted in the death of approximately 500,000 hens, according to information released at the time. Considering the impact of heat waves on layer mortality, the objective of this study was to analyze how heat waves impact the layer farming in the region of Bastos, considering the climate change scenarios forecasted by the IPCC for the next years. This study was conducted in three stages: i) analysis of the IPCC reports to understand climate change scenarios; ii) analysis of historical temperature data in the region of Bastos; iii) analysis of how climate change, through heat waves,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg production; Extreme event; IPCC; Laying hens; Mortality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000400657

Behavior of Layers under Different Light Sources
Provedor de dados: 89
Autores: Tavares,BO; Pereira,DF; Bueno,LGF; Silva,GF.
ABSTRACT Light is an important factor in the management of laying poultry. The ideal lamp spectrum that provides the best welfare conditions still needs to be determined. Wavelength and light intensity influence poultry behavior and their welfare. This study evaluated the influence of four lamps types with different light spectra on the behavior of seventy 52-week laying hens. Incandescent, fluorescent, and sodium and mercury vapor lamps were set in a different poultry house each and supplied similar light intensities. Layer behavior was video-recorded three times weekly using video cameras installed on the ceiling. The effects of different wavelengths emitted by the light sources on layer behavior were evaluated by the Kruskal-Wallis median test. Results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal behavior; Light; Animal precision.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400511

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

Comparison of National and International Standards of Good Egg Production Practices
Provedor de dados: 89
Autores: Sousa,GP; Pereira,DF; Watanabe,K; Cataneo,PF.
ABSTRACT Egg production is an important economic activity in Brazil, with about 697 million eggs produced annually. The conventional cage system is commonly used for egg production. However, there has been a growing concern for the welfare of laying hens around the world. In this context, many countries have issued laws, protocols, and other normative technical specifications to ensure the welfare of layers. This study aims at identifying similarities and differences between international standards and Brazilian protocols using the Comparative Law perspective. This article reports an analytical study of selected protocols, performing three analyses using the Comparative Law method. The research concludes that some items of the Brazilian protocols of good...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg production; Animal welfare; Comparative Law; Legislation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000400581

Correlations between thermal environment and egg quality of two layer commercial strains
Provedor de dados: 89
Autores: Pereira,DF; Vitorasso,G; Oliveira,SC; Kakimoto,SK; Togashi,CK; Soares,NM.
Heat stress limits the productivity of laying hens, as reflected by egg production and egg quality. The present study aimed at showing the correlations between egg quality parameters and environmental variables recorded on the day eggs were laid and on the previous days. Birds were housed in battery cages in a commercial poultry house. Main component analyses were used to verify associations between environmental and production variables, and Pearson's linear correlation tests were used to further investigate those associations. Analyses were carried out separately for to layer strains, Dekalb® White and Hy-Line® w36, and the variables egg weight (g), eggshell weight (g), specific gravity (g/cm³) and eggshell percentage (%) were compared with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cage; Egg quality; Environment; Layer; Poultry house.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000200002

Correlations among behavior, performance and environment in broiler breeders using multivariate analysis
Provedor de dados: 89
Autores: Pereira,DF; Nääs,A; Salgado,DA; Gaspar,CR; Bighi,CA; Penha,NLJ.
Animal welfare issues have received much attention not only to supply farmed animal requirements, but also to ethical and cultural public concerns. Daily collected information, as well as the systematic follow-up of production stages, produces important statistical data for production assessment and control, as well as for improvement possibilities. In this scenario, this research study analyzed behavioral, production, and environmental data using Main Component Multivariable Analysis, which correlated observed behaviors, recorded using video cameras and electronic identification, with performance parameters of female broiler breeders. The aim was to start building a system to support decision-making in broiler breeder housing, based on bird behavioral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal welfare; Behavior; Heat stress.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000400001

Selecting the most adequate bedding material for broiler production in Brazil
Provedor de dados: 89
Autores: Garcia,RG; Almeida Paz,ICL; Caldara,FR; Nääs,IA; Pereira,DF; Ferreira,VMOS.
Broiler chicken production is widely dispersed across the globe, and one important issue for growers is the selection of adequate bedding material, as the availability and price of substrates varies among countries and regions within a same country. This study aimed at applying a multiple criteria analysis approach for the selection of the most appropriate bedding material for broiler production. Based on field research data and growers' experience, the most desirable characteristics of a litter material were chosen as the main criteria. The selected materials were wood shavings, rice husks, chopped Napier grass (Pennisetum pupureum), 50% sugar cane bagasse (Saccharum L.) plus 50% wood shavings, 50% sugar cane bagasse (Saccharum L.) plus 50% rice husks,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative bedding material; Broiler production; Multiple criteria analysis; AHP.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000200006

Characterization of heat waves affecting mortality rates of broilers between 29 days and market age
Provedor de dados: 89
Autores: Vale,MM; Moura,DJ; Nääs,IA; Pereira,DF.
Climate may affect broiler production, especially where there are heat waves, which may cause high mortality rates due to the heat stress. Heat wave prediction and characterization may allow early mitigation actions to be taken. Data Mining is one of the tools used for such a characterization, particularly when a large number of variables is involved. The objective of this study was to classify heat waves that promote broiler chicken mortality in poultry houses equipped with minimal environmental control. A single day of heat, a heat-shock day, is capable of producing high broiler mortality. In poultry houses equipped with fans and evaporative cooling, the characterization of heat waves affecting broiler mortality between 29 days of age and market age...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat shock day; Heat wave; Mortality; Productivity losses.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000400010

Effect of the litter material on drinking water quality in broiler production
Provedor de dados: 89
Autores: Garcia,RG; Almeida,Paz ICL; Caldara,FR; Nääs,IA; Pereira,DF; Freitas,LW; Schwingel,AW; Lima,NDS; Graciano,JD.
Considering the importance of drinking water and its effect on broiler performance, drinking water quality was studied using six different litter materials. The presence of coliform bacteria and Escherichia coli was investigated. The following litter materials were used in the trial: wood shavings, rice husks, chopped Napier grass (Pennisetum pupureum), 50% sugarcane bagasse (Saccharum L.) + 50% wood shavings, 50% sugarcane bagasse (Saccharum L.) + 50% rice husks, and plain sugarcane bagasse (Saccharum L.). A number of 1620 Ross® one-day-old chicks were reared in 54 pens measuring 4.5 m² each, equipped with a bell drinker and a tube feeder. Water samples were collected in sterile tubes on days 28 and 42 of the rearing period, and submitted to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler health; Contamination; Welfare.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000300005

Selecting appropriate bedding to reduce locomotion problems in broilers
Provedor de dados: 89
Autores: Almeida Paz,ICL; Garcia,RG; Bernardi,R; Nääs,IA; Caldara,FR; Freitas,LW; Seno,LO; Ferreira,VMOS; Pereira,DF; Cavichiolo,F.
Two experiments were carried out at the Poultry Sector of the School of Agrarian Sciences of the Federal University of Grande Dourados to evaluate the incidence of leg problems in broilers reared on two distinct types of bedding material: rice husks or wood shavings, both new and reused. In both trials, a randomized experimental design was applied in factorial arrangement (2 x 2 x 2) using two genetic strains (Cobb® or Ross®); two sexes (male or female), and two litter materials (rice husks or wood shavings). In each trial 1080 one day pullets were reared equally divided in the treatments. The birds were placed in 4.5 m² boxes at a density of 10 birds m-2. All birds were fed diets with equal nutritional density, and water was offered ad libitum. Feeds were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gait score; Leg problems; Multicriteria analysis; Rice husks; Wood shaving.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000300008

Some aspects of chicken behavior and welfare
Provedor de dados: 89
Autores: Costa,LS; Pereira,DF; Bueno,LGF; Pandorfi,H.
Brazil is the world leader in broiler production and export. It achieved this position mainly to its excellent supply chain structure and climate, which favor poultry and grain production throughout its territory. Although Brazilian egg production is not as important as broiler production, this segment presents great potential of increasing its share in the global market. However, as elsewhere in the world, Brazilian poultry production faces the challenge to balance two elements within its supply chain: cruelty and productivity. The consumers of the European Union (EU) are very concerned with animal welfare issues. In order to increase its share in the European market, and eventually in the world market, Brazilian poultry producers must understand the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enriched environment; Precision poultry production; Consumer market; Productivity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000300001