Página 1 dos resultados de 260 itens digitais encontrados em 0.012 segundos

Meat quality of broilers from different rearing systems

AGUIAR, A. P. S.; CONTRERAS-CASTILLO, C. J.; BAGGIO, S. R.; VICENTE, E.
Fonte: CHIRIOTTI EDITORI Publicador: CHIRIOTTI EDITORI
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.15%
Color, pH, shear force, water-holding capacity, chemical composition, cholesterol content, and fatty acid profile from conventional, free-range and alternative broiler breast meat were determined in order to evaluate differences in the quality of broiler meat produced under different systems. Broilers reared in a conventional system had the highest lipid content (1.3%) but lower proportions of polyunsaturated (17.3%) and omega-3 fatty acids (0.3%) (p<0.05) compared to free-range and alternative broilers. On the other hand, free-range broilers had a lower cholesterol content (48.6 mg center dot 100 g(-1)) and lower pH (5.7 1) while broilers raised in an alternative system had a higher shear force (2.33 kgf) and lower yellowness value (b* value = 3.15) when compared to the other rearing systems (p<0.05).

Efeitos de fatores genéticos e do sistema de criação sobre o desempenho e o rendimento de carcaça de frangos tipo caipira.; Effect of genetic factors and rearing system on the performance and carcass yield of free range broiler chickens.

Hellmeister Filho, Paulo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 13/01/2003 PT
Relevância na Pesquisa
46.27%
O experimento teve por objetivo verificar os efeitos de fatores genéticos e do sistema de criação sobre o desempenho e o rendimento de carcaça de frangos tipo caipira. Foram utilizados 1120 pintos de um dia provenientes de ovos férteis de quatro linhagens alternativas de frango de corte tipo caipira, sendo duas comerciais e duas experimentais, desenvolvidas no Departamento de Genética da ESALQ/USP. Foi empregado o delineamento experimental em faixas com oito tratamentos, quatro repetições e 35 aves por unidade experimental. As linhagens foram: Comercial Label Rouge (crescimento lento), Comercial Paraíso Pedrês (crescimento rápido), Experimental Caipirinha (crescimento lento), Experimental 7P (crescimento rápido). As variáveis estudadas foram: idade das aves ao atingir o peso de 2300g (Idade 2300), ganho de peso médio diário (GPMD), consumo médio de ração (CR), conversão alimentar (CA), mortalidade, rendimento das partes principais da carcaça (carcaça eviscerada, pernas, asa, peito, dorso, carne de perna e carne de peito) e .rendimento das partes secundárias da carcaça (osso de perna, osso de perna, pele de perna, pele de coxa, gordura abdominal, vísceras, pés e cabeça + pescoço). Os tratamentos experimentais consistiram de quatro linhagens caipiras criadas nos sistemas intensivo e semi-intensivo...

Uso da zootecnia de precisão na avaliação do bem-estar bioclimático de aves poedeiras em diferentes sistemas de criação; Use of precision animal production on bioclimatic welfare evaluations of laying hens in different rearing systems

Alves, Sulivan Pereira
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 12/02/2007 PT
Relevância na Pesquisa
66.4%
O objetivo geral desta pesquisa foi avaliar o bem-estar de aves poedeiras em dois diferentes sistemas de criação (gaiola e cama) e a qualidade desses sistemas em relação aos aspectos comportamentais, fisiológicos e produtivos utilizando ferramentas da zootecnia de precisão. O experimento foi desenvolvido no Setor de Avicultura do Departamento de Zootecnia da Escola Superior de Agricultura Luiz de Queiroz (ESALQ/USP) em Piracicaba, SP. A pesquisa constou de cinco períodos experimentais de 28 dias cada. Foram utilizadas 64 poedeiras da linhagem Isabrown e 64 poedeiras da linhagem Hy-Line W-36 com 19 e 21 semanas de idade respectivamente. O regime de luz adotado foi de 16 horas claro e 8 horas de escuro. Foram estabelecidos 2 tratamentos, sendo Tratamento 1: criação em gaiolas convencionais; Tratamento 2: sistema de criação em cama. O delineamento experimental adotado foi o inteiramente casualizado, em esquema fatorial 2x2 (2 linhagens e 2 sistemas de criação) com 4 repetições cada. A pesquisa abordou diferentes parâmetros: análise bioclimática; análise fisiológica; análise do desempenho zootécnico; análise da qualidade dos ovos; análise dos comportamentos; análise das condições de empenamento e aplicação da lógica Fuzzy na avaliação dos dados. A avaliação térmica foi realizada mediante a análise dos dados de temperatura do ar seco...

Seleção de ácaros da ordem Astigmata (Acari) para uso como alimento na criação de ácaros predadores fitoseídeos (Acari: Phytoseiidae); Screening of mites of the order Astigmata (Acari) for use as food sources in the mass rearing of predaceous phytoseiid mites (Acari: Phytoseiidae)

Barbosa, Marina Ferraz de Camargo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/01/2012 PT
Relevância na Pesquisa
36.17%
Ácaros da família Phytoseiidae são os predadores mais utilizados para o controle biológico de ácaros-praga. Atualmente, a produção destes ácaros é realizada em um sistema tritrófico, em que o predador é multiplicado sobre plantas infestadas por suas presas. Apesar de eficiente, este método apresenta diversas dificuldades, como o alto custo de produção e a necessidade de espaços amplos para ser mantido. Uma forma de facilitar a produção destes fitoseídeos é a utilização de presas alternativas, que possam ser criadas em espaços restritos. Ácaros da ordem Astigmata ocorrem frequentemente em depósitos de alimentos, podendo ser criados em farinhas, farelos ou meios semelhantes. O objetivo do presente trabalho foi determinar espécies de Astigmata com potencial de uso na produção massal dos fitoseídeos Euseius concordis (Chant), Iphiseiodes zuluagai Denmark e Muma, Neoseiulus barkeri Hughes e Neoseiulus californicus McGregor. Inicialmente, realizou-se um teste de oviposição com 10 espécies de Astigmata para cada espécie de predador. As duas espécies de presa que permitiram melhor oviposição para cada fitoseídeo foram utilizadas para a elaboração de tabelas de vida e fertilidade. A oviposição e a sobrevivência de Neoseiulus barkeri foram consideradas altas quando o predador foi alimentado com nove das presas. Os valores de rm foram altos para Thyreophagus sp. (0...

Estimativa de custos de três sistemas alimentares para a recria de novilhas acasaladas aos 18 meses de idade; Feeding systems costs for rearing beef heifers bred at 18 months of age

Canellas, Leonardo Canali; Marques, Pedro Rocha; Barcellos, Julio Otavio Jardim; Lampert, Vinícius do Nascimento; Braccini Neto, José
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
POR
Relevância na Pesquisa
36.49%
A idade ao acasalamento da novilha está relacionada com a eficiência econômica da produção de bovinos. A determinação de sistemas alimentares para a recria é fundamental para que as novilhas apresentem elevada taxa de prenhez. O objetivo deste trabalho foi estimar e avaliar os custos de alternativas alimentares na recria de novilhas de corte destinadas ao acasalamento aos 18 meses de idade. Foram avaliados sistemas alimentares que atendessem o ganho de peso em cada fase da recria utilizando o campo natural e suplementos alimentares para determinar o custo final do sistema. Para tanto foram definidos os seguintes pressupostos: peso ao desmame – 160 kg; ganho do desmame ao início do acasalamento – 140 kg; peso ao início do acasalamento – 300 kg (raça britânica, 65% do peso adulto). Os tratamentos foram denominados conforme o ganho de peso diário médio (GDM) no primeiro (INV), segundo (PRI) e terceiro (VER) período, respectivamente: BAM – Baixo (0,000 kg/d), Alto (1,111 kg/d) e Moderado (0,500 kg/d); MMA – Moderado (0,120 kg/d), Moderado (0,800 kg/d) e Alto (0,500 kg/d); ABB – Alto (0,373 kg/d), Baixo (0,600 kg/d) e Baixo (0,300 kg/d). O sistema de recria ABB apresentou o menor custo (R$ 96,19/cab), seguido pelo MMA (R$ 114...

Município de Canguçu, RS : o relevo e sua morfodinâmica como condicionantes do dinamismo agrícola

Viera, Valmir
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
36.37%
O estudo do relevo e sua relação com os solos que ocorrem na área de estudo no município de Canguçu/RS, objetiva promover uma análise detalhada e comparativa desses componentes naturais que condicionam o aumento ou a diminuição das potencialidades ou das limitações ao uso do solo no desenvolvimento dos sistemas de cultivo e criação. Para a realização do trabalho foram utilizadas imagens de satélite Quickbird (2008), trabalho de campo e de laboratório. O mapeamento, através da utilização do programa ArcGis com dados Aster GDEM – Global Digital Elevation Model que serviram para delimitar os compartimentos litológicos, geomorfológicos associados aos tipos de solos, resultou no mapa em escala 1:50.000. Dessa forma, nesse município, apesar dos mapeamentos anteriores identificarem apenas um compartimento geomorfológico (Planalto), pode-se subdividi-lo em relevo de Cristas e relevo de Colinas. Observa-se a ocorrência de Neossolos associados aos afloramentos rochosos e ao relevo de Cristas; Cambissolos e Argissolos localizados no relevo de Colinas e Gleissolos nas planícies próximas a rede de drenagem. Nesse sentido, identificou-se, nos resultados, que os solos localizados em relevo de Cristas sustentam, principalmente...

Economic evaluation of Piaractus mesopotamicus juvenile production in different rearing systems

Jomori, Rosangela Kiyoko; Carneiro, Dalton José; Martins, Maria Inez Espagnoli Geraldo; Portella, Maria Célia
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 175-183
ENG
Relevância na Pesquisa
46.25%
In this study, the costs and gross income related to the production of pacu Piaractus mesopotamicus juveniles were evaluated. This evaluation took into consideration a semi-intensive rearing, with direct stocking of the larvae into fertilized ponds (IL 0), or an initial intensive larviculture system, in which the larvae were fed in the laboratory for 3 (IL 3), 6 (IL 6), or 9 days (IL 9) before being transferred to the ponds. After 45 days of rearing, a gradual increase in production costs was observed as intensive larviculture time increased. Gross income also increased due to better survival rates (11.0, 25.3, 45.4, and 54.0% for IL 0, IL 3, IL 6, and IL 9, respectively). Therefore, increased profits were obtained under intensive larviculture (US$ 0.27, US$ 6.07, US$ 11.99, and US$ 13.16 per one thousand larvae in treatments IL 0, IL 3, IL 6, and IL 9, respectively). In a larger scale production simulation, the results obtained with initial intensive larviculture also showed evident economic advantages, confirming the feasibility of this system in comparison with the direct stocking of larvae in ponds for the production of pacu juveniles. © 2004 Elsevier B.V. All rights reserved.

Evaluating two systems of poultry production: conventional and free-range

Lima,AMC; Nääs,IA
Fonte: Fundação APINCO de Ciência e Tecnologia Avícolas Publicador: Fundação APINCO de Ciência e Tecnologia Avícolas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2005 EN
Relevância na Pesquisa
36.08%
The improvement in production technology was the major factor that lead Brazil to become the third largest poultry producer. The improvement was world´s based on the careful control of several aspects, including which nutrition and management (environment, health and rearing systems). Nowadays, the search for good welfare conditions is a global tendency in animal production. Concomitantly, an extensive production system of free-range broilers has been increasing in Brazil. This study evaluated in situ production indexes of two different commercial broiler productions, an intensive and conventional (farm A) and a semi-extensive free-range production (farm B), in order to assess the relationship between productivity and management. It was observed that the physical environment in farm A presented higher temperatures and relative humidity. Based on the results, the production index was better in farm A than in farm B. It was not clear that the production index was related to inadequate welfare of broilers under the conventional rearing system.

Proximate composition and meat quality of broilers reared under different production systems

Souza,XR; Faria,PB; Bressan,MC
Fonte: Fundação APINCO de Ciência e Tecnologia Avícolas Publicador: Fundação APINCO de Ciência e Tecnologia Avícolas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2011 EN
Relevância na Pesquisa
36.23%
In this study, the physical-chemical characteristics and proximate composition of the meat of of two strains of broilers (Paraíso Pedrês and Máster gris plumé - Super Pesadão, utilized for semi-intensive rearing) and Cobb® strain, utilized in intensive rearing systems) were evaluated. Differences related to strain and sex (males and females) were studied. Cobb® broilers were slaughtered at 45 days and the other strains at 85 days. The following characteristics were evaluated in breast and thigh meat: moisture, protein, ether extract, ashes, color (CIEL*a*b*), final pH, cooking loss (CL) and shear force (SF). Bird strain and sex influenced breast color parameters, with Cobb® presenting higher yellowness (b*) and redness (a*) means, whereas females had higher b* values and males, a* values. Paraíso Pedrês had lower SF values. As to proximate composition, there was an interaction between strain and sex, with higher ether extract values in the meat of Super Pesadão males. Cobb® birds presented higher lightness (L*) and b* values, and there was no effect of sex on color parameters. Higher pH and SF values were found in the meat of Super Pesadão birds. There was an interaction between strain and sex for b* and SF values, with higher b* values obtained with Cobb® males...

Phthiraptera (Arthropoda, Insecta) in Gallus gallus from isolated and mixed backyard rearing systems

Santos,Ana Clara Gomes dos; Rodrigues,Albério Lopes; Santos,Sandra Batista dos; Lima,Roberto César Araújo; Guerra,Rita de Maria Seabra Nogueira de Candanedo
Fonte: Colégio Brasileiro de Parasitologia Veterinária Publicador: Colégio Brasileiro de Parasitologia Veterinária
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2011 EN
Relevância na Pesquisa
46.26%
The objectives were to identify the species of chewing lice (Mallophaga) at different body sites in chickens (Gallus gallus), in isolated and mixed rearing systems, and to determine the dynamics and structure of the louse populations collected. The prevalences were 100 and 35% for chickens in the isolated and mixed systems, respectively. The species recorded were: Menopon gallinae, Menacanthus stramineus, Goniodes gigas, Goniocotes gallinae and Lipeurus caponis. The chickens in the isolated system presented more lice than did the ones in the mixed system. The most prevalent species were M. gallinae (30.58 and 62.31%) and L. caponis (29.12 and 14.49%), in the isolated and mixed systems, respectively. The preferential sites of parasitism were the dorsum, venter and wings among the chickens in the isolated system, while among the ones in the mixed system, the preferential sites were the dorsum and venter. The mean intensity of infestation in the isolated system was 111.4 for males and 19.1 for females, while in the mixed system it was 80 for males and 6.75 for females. The amplitudes of the infestation were 1-226 for males and 1-22 for females in the isolated system, while in the mixed system, the amplitudes were 1-111 and 1-8, respectively. It can be concluded that chickens reared in the isolated system harbor a greater number of lice than do chickens in the mixed system. However...

Comparison among Different Gilthead Sea Bream (Sparus aurata) Farming Systems: Activity of Intestinal and Hepatic Enzymes and 13C-NMR Analysis of Lipids

Coco, Laura Del; Papadia, Paride; Pascali, Sandra A. De; Bressani, Giorgia; Storelli, Carlo; Zonno, Vincenzo; Fanizzi, Francesco Paolo
Fonte: Molecular Diversity Preservation International Publicador: Molecular Diversity Preservation International
Tipo: Artigo de Revista Científica
Publicado em 18/12/2009 EN
Relevância na Pesquisa
36.12%
In order to evaluate differences in general health and nutritional values of gilthead sea bream (Sparus aurata), the effects of semi-intensive, land-based tanks and sea-cages intensive rearing systems were investigated, and results compared with captured wild fish. The physiological state was determined by measuring the activity of three different intestinal digestive enzymes: alkaline phosphatase (ALP), leucine aminopeptidase (LAP) and maltase; and the activity of the hepatic ALP. Also, the hepatic content in protein, cholesterol, and lipid were assessed. 13C-NMR analysis for qualitative and quantitative characterization of the lipid fraction extracted from fish muscles for semi-intensive and land based tanks intensive systems was performed. The lipid fraction composition showed small but significant differences in the monounsaturated/saturated fatty acid ratio, with the semi-intensive characterized by higher monounsaturated and lower saturated fatty acid content with respect to land based tanks intensive rearing system.

Effects of Rearing Systems on Performance, Egg Characteristics and Immune Response in Two Layer Hen Genotype

Küçükyılmaz, Kamil; Bozkurt, Mehmet; Herken, Emine Nur; Çınar, Mustafa; Çatlı, Abdullah Uğur; Bintaş, Erol; Çöven, Fethiye
Fonte: Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST) Publicador: Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST)
Tipo: Artigo de Revista Científica
Publicado em /04/2012 EN
Relevância na Pesquisa
46.34%
White (Lohmann LSL) and Brown (ATAK-S) laying hens, were reared under organic and conventional cage rearing systems, and the effects of the rearing system on performance parameters, egg production, egg characteristics, and immune response were investigated. For this purpose, a total of 832 laying hens of two commercial hybrids, i.e., 416 white (Lohmann LSL) and 416 Brown (ATAK-S) layers, were used. The experiment lasted between 23 and 70 wk of age. In this study, the white layers yielded more eggs as compared to the brown layers in both organic and conventional production systems. Egg weight exhibited a similar pattern to that of laying performance. However, the total hen-housed egg number for the white birds in the organic system was fewer than that of white birds in the conventional cage facility; conversely, a contradictory tendency was observed for the brown birds. Livability of the white layers in the organic system was remarkably lower (14%) than that of the brown line, whereas the white line survived better (3.42%) than their brown counterparts in conventional cages. The feed conversion ratio of the white hens was markedly inferior in the organic system as compared to that of the white hens in the conventional system, whereas relatively lower deterioration was reported in brown layers when reared in an organic system. The organic production system increased egg albumen height and the Haugh unit in eggs of the brown layers. The yolk color score of organic eggs was lower than that of conventional eggs for both brown and white hens. The egg yolk ratio of eggs from white layers was found to be higher in organic eggs as compared to those obtained in the conventional system. All organic eggs had heavier shells than those produced in the conventional system. Eggs from brown layers had more protein content than eggs from white layers. Neither housing systems nor genotype influenced egg yolk cholesterol concentration. When compared to conventional eggs...

Rearing of Octopus vulgaris paralarvae Present status, bottlenecks and trends

Iglesias, José; Sánchez, Francisco Javier; Bersano, José Guilherme Filho; Carrasco, José Francisco; Dhont, Jean; Fuentes, Lidia; Linares, Fátima; Muñoz, José Luís; Okumura, Shigenobu; Roo, Javier; Meeren, Terje Van der; Vidal, Erica Alves Gonzalez
Fonte: Universidade Federal do Rio Grande Publicador: Universidade Federal do Rio Grande
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.32%
Due to the high mortality rates and poor growth generally observed in Octopus vulgaris paralarval rearing experiments, it was decided to organize a working group in order to formulate recommendations to tackle this problem. Over a dozen scientists representing the most active current research groups related to this subject attended the meeting in Vigo, Spain, in November 2005. The aim of this working group was to determine the bottlenecks that prevent success in paralarval rearing, define the most appropriate rearing conditions, and identify required future research. This paper describes rearing techniques for the O. vulgaris paralarvae used by the different research participant teams, with regard to tank systems, feeding environment, and diets (Artemia, crustacean zoeae, sandeel flakes, copepods, etc.). Additionally, it includes other related themes such as the culture of Artemia and copepods, organisms that are commonly used in paralarval rearing. When embarking on O. vulgaris rearing it is advised to use prey rich in DHA (docosaenoic acid, 22:6n-3) and EPA (eicosapentaenoic acid, 20:5n-3), and with high DHA/EPA ratio. Such prey could be enriched Artemia, accompanied or not by crustacean zoeae or any microdiet. It is also recommended that...

Inappropriate management conditions, especially for the regressed class, are related to sperm quality in Prochilodus lineatus

De Souza, Thiago G.; Hainfellner, Patrick; Kuradomi, Rafael Y.; Munoz, Mario E.; Honji, Renato M.; Moreira, Renata G.; Batlouni, Sergio R.
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 797-807
ENG
Relevância na Pesquisa
36.19%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Processo FAPESP: 2009/00541-6; The aims of this study were to evaluate the characteristics of the reproductive classes and semen quality in curimbata (Prochilodus lineatus) breeders maintained in two different rearing systems. To achieve this goal, cages (Cs) and earthen ponds (EPs) were used as experimental systems to provide unsuitable and suitable conditions, respectively. The fish were maintained under the experimental conditions for 18 months. During this period, males were randomly sampled every 2 months for biometric analysis (n = 30 per sample) and for an evaluation of selected characteristics of the testes (n = 5 per sample). After this period, males maintained in EPs and males maintained in Cs (CMs) were evaluated in induced breeding experiments. We observed that rearing P. lineatus in a C at a high stocking density for the long 18-month period of study produced reductions in growth, testis development, gonadosomatic index values, and sperm quality in the fish. We found differences between the groups in all the reproductive classes examined, especially in the regression class, which showed a pronounced accumulation of immature germ cells in the CMs. In this group...

Breeding objectives for a Nellore cattle rearing system

Carvalho,Caio Victor Damasceno; Bittencourt,Thereza Cristina Calmon de
Fonte: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira Publicador: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2015 EN
Relevância na Pesquisa
35.99%
Abstract:The objective of this work was to define the traits that should be included as breeding objectives for Nellore cattle, according to simulations with a bio-economic model for rearing systems. The economic values (EVs) of the traits were calculated as the differences between the profits due to an increased performance of 1% in each trait, with the others traits remaining constant. To determine the impact of each selection on the revenue system, two scenarios were simulated based on the traits being selected. In the first scenario, the adopted selection criteria were: weaning weight (WW), weaning rate (WR), yearling weight (YW), and mature cow weight (MCW). In the second scenario, the cumulative productivity (CP) of dams was used as an indirect evaluation of the performance of calves, with all the other traits included, except WW. In the first scenario, an EV of R$ 1.44 kg-1 was obtained for WW. In the second scenario, an EV of R$ 2.91 kg-1 was obtained for CP. The trait with the highest EV in both scenarios was WR, which enhanced the profits by R$ 3.21 for each 1% increased performance. The meat price paid to the producer is the factor with the greatest impact on the EVs of all examined traits.

Model-predicted ammonia emission from two broiler houses with different rearing systems

Lima,Nilsa Duarte Silva; Garcia,Rodrigo Garófallo; Nääs,Irenilza Alencar; Caldara,Fabiana Ribeiro; Ponso,Roselaine
Fonte: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" Publicador: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2015 EN
Relevância na Pesquisa
36.12%
Ammonia (NH3) emissions from broiler production can affect human and animal health and may cause acidification and eutrophication of the surrounding environment. This study aimed to estimate ammonia emissions from broiler litter in two systems of forced ventilation, the tunnel ventilation (TV) and the dark house (DH). The experiment was carried out on eight commercial broiler houses, and the age of the birds (day, d), pH and litter temperature were recorded. Broilers were reared on built-up wood shaving litter using an average flock density of 14 bird m–2. Temperature and relative humidity inside the broiler houses were recorded in the morning during the grow-out period. A factorial experimental design was adopted, with two types of houses, four replicates and two flocks with two replicates each. A deterministic model was used to predict ammonia emissions using the litter pH and temperature, and the day of grow-out. The highest litter temperature and pH were found at 42 d of growth in both housing systems. Mean ambient air temperature and relative humidity did not differ in either system. Mean model predicted ammonia emission was higher in the DH rearing system (5200 mg NH3 m−2h−1 at 42 d) than in the TV system (2700 mg NH3m−2 h−1 at 42 d). TV presented the lowest mean litter temperature and pH at 42 d of growth. In the last week of the broilers’ grow-out cycle...

Impact of Artificial Rearing Systems on the Developmental and Reproductive Fitness of the Predatory Bug, Orius laevigatus

Bonte, Maarten; Clercq, Patrick De
Fonte: University of Wisconsin Library Publicador: University of Wisconsin Library
Tipo: Artigo de Revista Científica
Publicado em 13/07/2010 EN
Relevância na Pesquisa
36.1%
This study investigated the effect of several substrate types and moisture sources on the developmental and reproductive fitness of the zoophytophagous predator Orius laevigatus (Fieber) (Hemiptera: Anthocoridae) when fed a factitious prey (i.e. unnatural prey) Ephestia kuehniella (Zeller) eggs, or a meridic artificial diet based on hen's egg yolk. O. laevigatus is known to feed on plants as an alternative food source and to oviposit in plants. E. kuehniella eggs were superior to the artificial diet. Supplementary feeding on plant materials did not compensate for the nutritional shortcomings of the artificial diet. Survival rates showed that oviposition substrates such as bean pods or lipophilic surfaces such as wax paper and plastic were more suitable for rearing O. laevigatus than household paper. The use of green bean pods as a plant substrate did not have a beneficial effect on O. laevigatus. The results indicated that O. laevigatus can successfully complete its nymphal development and realize its full reproductive potential in the absence of plant material. However, plant materials would still be required for oviposition, unless a reliable and cost-effective artificial oviposition substrate were made available. The omission of plant materials from the rearing procedures may reduce production cost of this species and other heteropteran predators.

Energy requirement for maintenance and gain for two genotypes of quails housed in different breeding rearing systems

Jordão Filho,José; Silva,José Humberto Vilar da; Silva,Cidinei Trajano; Costa,Fernando Guilherme Perazzo; Sousa,Janaína Maria Batista de; Givisiez,Patrícia Emília Naves
Fonte: Sociedade Brasileira de Zootecnia Publicador: Sociedade Brasileira de Zootecnia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2011 EN
Relevância na Pesquisa
46.08%
This study aimed to estimate the energy requirements for maintenance and gain of Japanese and European quails under growth housed in two rearing systems: floor pens and cages. To determine maintenance requirements, two experiments were conducted with birds housed in cages in environmental chambers (experiment 1) and in floor pens at room temperature conditions (experiment 2). The experimental design was completely randomized with four levels of feed supply (100, 75, 50 and 25%) and four repetitions. Energy requirements for maintenance were estimated by the comparative slaughter method through a feeding trial. In experiment 1, 64 Japanese and European quails per treatment were housed in cages of climatic chambers at 18, 24, and 28 °C, while in experiment 2, 352 quails per treatment were housed in floor pens at room temperature (26 °C). To estimate gain requirements, five slaughters were performed with quails receiving feed ad libitum and housed under controlled temperature of 18 °C (experiment 3). Prediction equations were obtained to estimate requirements for maintenance and gain of energy for the two genotypes of quails. The room temperature and breeding system affected the estimates of energy requirements for maintenance. The genotypes presented different estimates for maintenance and gain. Prediction models should be developed considering the room temperature and quails' genotypes.

Model-predicted ammonia emission from two broiler houses with different rearing systems

Lima, Nilsa Duarte Silva; Garcia, Rodrigo Garófallo; Nääs, Irenilza Alencar; Caldara, Fabiana Ribeiro; Ponso, Roselaine
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/10/2015 ENG
Relevância na Pesquisa
36.12%
Ammonia (NH3) emissions from broiler production can affect human and animal health and may cause acidification and eutrophication of the surrounding environment. This study aimed to estimate ammonia emissions from broiler litter in two systems of forced ventilation, the tunnel ventilation (TV) and the dark house (DH). The experiment was carried out on eight commercial broiler houses, and the age of the birds (day, d), pH and litter temperature were recorded. Broilers were reared on built-up wood shaving litter using an average flock density of 14 bird m–2. Temperature and relative humidity inside the broiler houses were recorded in the morning during the grow-out period. A factorial experimental design was adopted, with two types of houses, four replicates and two flocks with two replicates each. A deterministic model was used to predict ammonia emissions using the litter pH and temperature, and the day of grow-out. The highest litter temperature and pH were found at 42 d of growth in both housing systems. Mean ambient air temperature and relative humidity did not differ in either system. Mean model predicted ammonia emission was higher in the DH rearing system (5200 mg NH3 m−2h−1 at 42 d) than in the TV system (2700 mg NH3m−2 h−1 at 42 d). TV presented the lowest mean litter temperature and pH at 42 d of growth. In the last week of the broilers’ grow-out cycle...

Chemical composition, fatty acid profile and colour of broiler meat as affected by organic and conventional rearing systems

Küçükyilmaz,K.; Bozkurt,M.; Çatli,A.U.; Herken,E.N.; Çinar,M.; Bintaş,E.
Fonte: South African Journal of Animal Science Publicador: South African Journal of Animal Science
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2012 EN
Relevância na Pesquisa
46.39%
The major quality characteristics of breast and thigh meat, including chemical composition, fatty acid composition, cholesterol content and colour of slow-growing broilers (Hubbard Red-JA), reared under either organic or conventional rearing systems, and fast-growing broilers (Ross-308) grown under the conventional procedure, were investigated in this comparative study. Slaughter age was 81 days and 42 days for slow- and fast-growing birds, respectively. A lower protein, but higher fat content was measured in the thigh meat of slow-growing broilers reared both in the organic and conventional systems, compared with conventionally reared fast growers. In both systems the breast meat of fast-growing birds had a higher moisture content than those of the slow-growing birds. The organic system promoted ash retention in breast meat compared with conventional rearing procedures. The fatty acid profile of thigh and breast meat showed different responses to broiler rearing systems. Both thigh and breast meat of conventionally reared slow-growing birds contained higher cholestorel levels. Breast and thigh meat yielded from conventionally reared fast-growing birds had a markedly higher red appearance, but a lower yellow colour, than those of slow growers. The organic system increased the yellowness of the meat. In conclusion...