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Registros recuperados: 8
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Ammonia emissions in tunnel-ventilated broiler houses Rev. Bras. Ciênc. Avic.
Lima,KAO; Moura,DJ; Carvalho,TMR; Bueno,LGF; Vercellino,RA.
Gas production in broiler houses and their emissions are closely related to the microclimate established inside the house according to air temperature, humidity, and velocity. Therefore, the internal house environment is influenced by building typology and ventilation system. The objective of the present study was to evaluate ammonia emission rates in broiler houses equipped with different ventilation systems (negative or positive pressure) and litter conditions (new or built-up). The environment of six commercial broiler houses was evaluated internal and external NH3 concentrations. Ventilation rates were recorded to estimate ammonia emission rates. The efficiency of circulation and exhaust fans was assessed, and higher ventilation rates were determined...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler production; Gas emissions; Ventilation systems.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000400008
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Behavior of Layers under Different Light Sources Rev. Bras. Ciênc. Avic.
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
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Broiler litter reutilization applying different composting concepts Rev. Bras. Ciênc. Avic.
Sonoda,LT; Moura,DJ; Bueno,LGF; Cordeiro,DC; Mendes,AS.
Broiler litter reutilization consists in using the same bedding material to cover the house floor for several broiler flocks. This requires the litter to be treated in order to reduce the amount of microorganisms, according to international recommendations. The aim of this study was to evaluate two methods of broiler litter fermentation based on composting concepts and their effect on litter and the air quality during fermentation in small-scale broiler houses. The experiment was carried out in the Environmental Laboratory I of the School of Agricultural Engineering of the State University of Campinas, utilizing six small-scale houses. Litter from the same grow-out (one, two or three) was distributed in two experimental houses, where it was either piled or...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fermentation; Nitrogen; Waste treatment; Broiler.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000300011
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Broiler walking ability and toe asymmetry under harsh rearing conditions Rev. Bras. Ciênc. Avic.
Baracho,MS; Nääs,IA; Bueno,LGF; Nascimento,GR; Moura,DJ.
Morphological asymmetry has been described as a potential broiler welfare indicator, for interpreting the birds' ability to cope with the challenges that may affect its growth. The objective of this study was to evaluate the use of morphological asymmetry data to estimate broiler walking ability and welfare.dBroilers werefed diets supplemented or not with vitamin D. Toes were measured when birds were 42 and 49 days old using digital caliper.the left and right sides of the following four bilateral traits (tarsometatarsus length, outer toe length, mid toe length, and back toe length) were measured twice on intact alive birds by two different researcherh. Data from right and left sides were compared in the two treatments using the Student t-test, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Asymmetry; Welfare; Poultry.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000300009
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Litter materials and the incidence of carcass lesions in broilers chickens Rev. Bras. Ciênc. Avic.
Garcia,RG; Almeida Paz,ICL; Caldara,FR; Nääs,IA; Bueno,LGF; Freitas,LW; Graciano,JD; Sim,S.
The aim of this study was to evaluate the effects of different litter materials on litter compaction, broiler feathering and the incidence of carcass lesions. In the experiment, 3240 one-day-old Ross® chicks were selected by sex and distributed according to a completely randomized experimental design in a 2 x 6 factorial arrangement (two sex and six litter materials). The following litter materials were used: wood shavings, rice husks, chopped Napier grass, 50% sugar cane bagasse plus 50% wood shavings, 50% sugar cane bagasse plus 50% rice husks, and pure sugar cane bagasse. Litter compaction was weekly assessed using a penetrometer. On days 21, 35 and 42 of the experimental period, feathering on the back and legs was scored according to a 0 - 10 scale. On...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compaction; Fathering; Quality; Substrate.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000100005
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Performance of Commercial Laying Hen Submitted to Different Debeaking Methods Rev. Bras. Ciênc. Avic.
Oka,CH; Bueno,LGF; Souza,SRL; Balan,JAO; Silva,KM; Polycarpo,GV; Iwayama,LH.
ABSTRACT Among the several factors required in breeding laying hens, debeaking is a factor that interferes with batch performance and affects animal welfare. Thus, the objective of this study was to evaluate three different debeaking procedures and to verify the best technique to be used. For this, the performance of the birds, the incidence of cannibalism, and in rearing phase, the quality of the eggs were evaluated. Dekalb White birds were distributed in a completely randomized design with three treatments, T1 (infrared radiation debeaking) T2 (hot blade debeaking) and T3 (V debeaking).The data was submitted to Analysis of Variance and compared by Tukey’s test (95%), using statistical software R. The frequencies of mortality and cannibalism were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal welfare; Behavior; Stress; Egg quality.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000400717
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Some aspects of chicken behavior and welfare Rev. Bras. Ciênc. Avic.
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
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Use of vitamin D to reduce lameness in broilers reared in harsh environments Rev. Bras. Ciênc. Avic.
Nääs,I de A; Baracho,M dos S; Bueno,LGF; Moura,DJ de; Vercelino,R do A; Salgado,DD.
In tropical poultry-producing countries, poultry houses usually have little environmental control. This study investigated the effect of dietary vitamin D on the incidence of leg abnormalities of a fast-growing broiler strain reared under harsh conditions. In this study, 300 one-day-old male broilers were distributed in two treatments with three replicates of 50 birds each. One group was fed a placebo and the other group was fed 25-hydroxycholecalciferol (25-OH-D3) in a soluble form. The environmental variables were weekly recorded during until birds were 49 days old. Birds were weekly gait scored, and their walking speed and vertical force while walking were assessed. Post-mortem examination was performed and skeletal lesions were assessed. Control birds...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feet force measurement; Leg abnormalities; Vitamin D supplement.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000300002
Registros recuperados: 8
Primeira ... 1 ... Última
 

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