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Search Results: 1 - 10 of 114006 matches for " Valdson José da;Dubeux Junior "
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Características morfológicas e produtivas de leguminosas forrageiras tropicais submetidas a duas frequências de corte
Silva, Valdson José da;Dubeux Junior, José Carlos Batista;Teixeira, Vicente Imbroisi;Santos, Mércia Virgínia Ferreira dos;Lira, Mario de Andrade;Mello, Alexandre Carneiro Le?o de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000100013
Abstract: the objective of this research was to evaluate morphological and productive characteristics of forage legumes under two harvest frequencies (28 and 56 days) and 10 cm harvest intensity. the following legume species were evaluated: arachis pintoi (cv. amarillo), clitoria ternatea, calopogonium mucunoides, desmodium ovalifolium (cv. itabela) and stylosanthes guianensis (cvs. bandeirante, cook, mineir?o). a randomized complete design was used in a factorial arrangement (07 legumes × 02 harvest frequencies), with four replications per treatment and the following variables were analyzed: biomass accumulation, number of branches per plant, number of live leaves/plant, root dry matter, nodule number, and nodule matter. shoot and root dry matter accumulation per unit time was similar for the harvests at every 28 or every 56 days, except for arachis, clitoria, and desmodium, which showed greater shoot and root biomass when harvested every 56 days. nodule number and nodule mass differed among legumes, but a greater nodule number was observed when the legumes were harvested every 56 days. live leaf number per plant was greater at 56 days, except for arachis and calopogonium which showed similar values for both frequencies. harvest frequency affected differently the morphologic and productive characteristics of the studied legumes that indicated the need for different management among the varieties tested.
Dinamica da associa??o de capim-milh? e capim-de-raiz em pasto diferido
Silva, Marta Gerusa Soares da;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Dubeux Junior, José Carlos Batista;Lins, Manuela Menezes;Silva, Camilla Vila Nova Soares;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011001100009
Abstract: this study aimed to evaluate the dynamics of the association of 'capim-de-raiz' (chloris orthonoton doell) and alexandergrass [brachiaria plantaginea (link) hitchc], as for persistence and production. gathering of botanical material, evaluation of botanical composition and forage mass were realized in deferred native pastures. to estimate forage mass, a randomized block design with four treatments was used, consisting of 60, 90, 120 and 150 days of deferring and five replications. the botanical composition was expressed as a percentage of the total. ten families, 15 genera, and 18 species were identified. in the botanical composition from may to august 2007, alexandergrass was the main component from 60 to 90 days, corresponding to 46.75 and 52.09%, respectively. in august 2007, other species participated with 57.75% of the botanical composition. in the assessment of the year 2008, at the end of the deferring period, other species occupied 100% of the botanical composition of pasture. the highest forage mass (kg dm/ha) for alexandergrass (2,736) occurred at 90 days; for other species (3,141) and 'capim-de-raiz' (2,701), it was at 120 days. the use of stockpiled forage should preferably take place after 60 to 90 days of deferring. after a year without interference, 'capim-de-raiz' and alexandergrass decrease participation in the botanical composition of pasture.
Uso de descritores morfológicos e herdabilidade de caracteres em clones de capim-elefante de porte baixo
Silva, Sharlyton Harysson Barbosa da;Santos, Mércia Virginia Ferreira dos;Lira, Mario de Andrade;Dubeux Junior, José Carlos Batista;Freitas, Erinaldo Viana de;Ferreira, Rinaldo Luiz Caraciolo;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009000800008
Abstract: the experiment was carried out with the objectives to evaluate the use of morphologic descriptor in the characterization and selection of dwarf elephant grass genotypes, and to evaluate the heritability of the evaluated traits. nine dwarf elephant grass clones were used (taiwan a.146 - 2.14, taiwan a.146 - 2.27, taiwan a.146 - 2.37, taiwan a.146 - 2.114, merker méxico - 6.2, merker méxico - 6.5, merker méxico - 6.31, cv. mott, and cnpgl92f198.7) was allotted to a randomized complete block design was used with three replications. the morphologic descriptors were applied every 60 days after the staging cut. a total of five cuts were performed at 60-day intervals using a height of 10 cm from ground level. among the evaluated dwarf elephant grass clones the tallest ones were more desirable, and this trait should be considered at the moment of selection. heritability estimate was high for all evaluated traits of dwarf elephant grass, varying from 66% for sheath wax to 100% for mid-rib color. the taiwan a.146 - 2.37 clone was similar to the mott cultivar. heritability values showed genetic variability among clones, detected at 60 days regrowth. some of the used morphologic descriptors allowed characterization of the evaluated genotypes. the clones taiwan a. 146-2.27, taiwan a. 146-2.37, taiwan a. 146-2.114, and merker méxico 6.31 were the tallest and showed greater total tillering intensity, and were more desirable, presenting greater potential for use under cutting.
Análise de trilha em caracteres produtivos de Pennisetum sob corte em Itambé, Pernambuco
Silva?, M?nica Alixandrina da;Lira, Mario de Andrade;Santos, Mércia Virgínia Ferreira dos;Dubeux Junior, José Carlos Batista;Cunha, Márcio Vieira da;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000700007
Abstract: this work aimed to estimate the correlation coefficients, determining the direct and indirect effects (path analysis) of explanatory independent variables on total dry matter production (main dependent variables) of five elephant grass clones in five cuts accomplished at the forest zone of pernambuco. each experimental plot measured 24 m2 with 2 m2 of utile area. there was high correlation between almost all the independent variables and the main variable. the characteristic leaf blade number per tiller, however, explained better the potential of dry matter production and leaf blade dry matter production, acting, respectively, in a direct and indirect way on the explanatory variables.
Association between the morphological and productive characteristics in the selection of elephant grass clones
Cunha, Márcio Vieira da;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Freitas, Erinaldo Viana de;Dubeux Junior, José Carlos Batista;Mello, Alexandre Carneiro Le?o de;Martins, Kalina Gerciane Rodovalho;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000300004
Abstract: the objectives in this work were to study the association between the morphological and productive characteristics in pennisetum sp. clones, and to identify the morphological characteristics responsible for the productivity in pennisetum cp. clones. the canonical correlations were evaluated and the path analysis was made from the simple genotypic correlation matrix between the morphological and productive characteristics of eight pennisetum sp. clones (taiwan a-146 2.37, taiwan a-146 2.27, taiwan-146 2.114, merker méxico mx 6.31, mott, hv-241, elefante b and iri-381). the canonical correlations were significant at 1% probability by the chi-square test. the first pair of canonic factors, with correlation of 0.9999, related the plants with the highest dry matter content to plants with lower leaf area indexes, light perception and leaf angle. the second pair of canonic factors, with correlation of 0.9999, related the plants with the highest dry matter production to the plants with higher basal tiller density, height, and low green leaf number per tiller. the results of the path analysis indicated that the light interception is determinant in dry matter content expression of pennisetum sp. clones, while the basal tiller density and plant height are responsible for dry matter production in these clones.
Potential of Caatinga forage plants in ruminant feeding
Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Dubeux Junior, José Carlos Batista;Guim, Adriana;Mello, Alexandre Carneiro Le?o de;Cunha, Márcio Vieira da;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001300023
Abstract: caatinga is the most important biome for the livestock in the brazilian semi-arid region. this review paper aimed to present information on different forage aspects of caatinga vegetation for ruminant feeding. caatinga vegetation is formed mainly by shrubs and small trees, usually presenting thorns, deciduous leaves, and leaf abscission occurring frequently at the onset of the dry season. additional components of the botanical composition in this biome includes the families cactaceae, bromeliaceae, and a herbaceous component formed by grasses, legumes, and forbs, often presenting annual cycle. quantitative information of caatinga vegetation is scarce in the literature, mainly for the herbaceous stratum. methodological aspects such as lack of standardization across evaluations make comparison regarding forage potential of caatinga plant species difficult. index species must be identified within each caatinga type. quantitative aspects of biological n2 fixation by caatinga species have not been extensively studied. regarding forage nutritive value, it is necessary to study n availability for ruminants in caatinga plants, since large proportion of this element may bind to fiber components (adin). manipulation of caatinga vegetation is an alternative to change forage quantity and quality for grazing animals, affecting their performance as a result. studies measuring qualitative and quantitative variability of native forage resources from caatinga are mandatory in order to improve animal feeding management, with the ultimate goal of creating sustainable animal production based on caatinga vegetation.
Parti o da biomassa e qualidade da forragem de Bahiagrass: Paspalun notatum cv. pensacola no centro-norte da Flórida = Biomass allocation and forage quality in a pensacola Bahiagrass pasture in north central Florida
Marcia Mascarenhas Grise,Lynn Sollenberger,José Carlos Dubeux Junior,Sindy Interrante
Acta Scientiarum : Animal Sciences , 2006,
Abstract: Visando medir efeitos do manejo da Bahiagrass cv. pensacola (Paspalum notatum Flüggeé) na reparti o de biomassa (kg ha-1) das folhas+colmos, serrapilheira, raízes+rizomas, e valor nutritivo da forragem, foi instalado um experimento próximo a Gainesville, Flórida,EUA. Tratamentos: três manejos contínuos (n o intensivo, moderadamente intensivo, altamente intensivo, recebendo 40, 120, e 360 kg N ha -1 ano-1 e com lota o de 1,2; 2,4 e 3,6 UA ha-1, respectivamente) e um tratamento de manejo rotacionado (7 dias de pastejo e 21 dias de descanso), recebendo 360 kg N ha-1 ano-1 e 3,6 UA ha-1 (1 U A= 500 kg). A biomassa de raízes+rizomas foi superior a de folhas+colmos. N o houve efeito dos tratamentos na biomassa de raízes+rizomas. A biomassa de raízes+rizomas decresceu durante a esta o de pastejo. A maior intensidade de manejo dos tratamentos altamente intensivo e rotacionado resultou em maior biomassa de folhas+colmos. A rela o raiz/parte aérea decresceu com a intensifica o do manejo. A biomassa de serrapilheira foi superior a de folhas+colmos nos tratamentos altamente intensivo e rotacionado, privilegiando a ciclagem de nutrienes via excre o animal. Os tratamentos n o afetaram a FDN nem a DIVMO da forragem, masintensifica o do manejo tende a elevar a DIV MO da forragem. This experiment evaluated a pensacola Bahiagrass pasture (Paspalum notatum Flüggeé). It was conducted near Gainesville, Florida, U SA, to measure the effect of pasture management on biomass allocation (kg ha -1) of herbage, litter, root+rhizome, as well as forage quality. Treatments were three continuously stocked (low, moderate, and high,receiving 40, 120, and 360 kg N fertilizer ha -1 yr-1and with stocking rates of 1.2, 2.4, and 3.6 AU ha-1, respectively) and one rotationally stocked (RS; 7 -d grazing and 21-d rest periods; N rate of 360 kg ha-1 yr-1, 1 AU = 500 kg) pasture. The root+rhizome biomass was 4 to 12 times greater than herbage biomass. There was no effect of treatment on root+rhizome biomass. The root+rhizome biomass decreased during the grazing season. The greater manageme nt intensityimposed on high and RS pastures resulted in greater herbage biomass. The root/herbage ratio decreased with the intensification of management. The litter biomass turned to be greater than herbage biomass in the high and RS treatment, characteri zing the different cycling pattern that goes through the animal excretions. Treatments affected neither herbage NDF nor IVDOM, but increasing management intensity tended to result in high IVDOM.
Five hypotheses about photojournalism in convergence scenes Cinco hipóteses sobre o fotojornalismo em cenários de convergência
José Afonso da Silva Junior
Discursos Fotográficos , 2012, DOI: 10.5433/11925
Abstract: O cenário de profundas altera es proporcionado pela convergência digital desdobra-se sobre a cadeia produtiva da fotografia de notícia. Problematizamos essa atividade através de etapas sucessivas de modo a categorizar o que seria o fotojornalismo em tempos de convergência. A partir desse patamar, trabalham-se cinco hipóteses gerais de como se articulam pontos chave na produ o do fotojornalismo contemporaneo. Por fim, essas hipóteses s o revisitadas criticamente em fun o de exemplos empíricos relacionados com a justaposi o entre fotojornalismo e convergência digital. The scene of deep changes provided by the digital convergence shows its results in the supply chain of news photograph. The article raises doubts about this activity by a succession of steps, classifying what could photojournalism be at convergence times. From this level, five general hypotheses are formulated, showing how key points articulate with the production of contemporary photojournalism. Finally, these hypotheses are critically revisited in the light of empirical examples related to the juxtaposition of photojournalism and digital convergence.
Legado e Heran a das Agências de Notícias para o Jornalismo na Web
SILVA JUNIOR, José Afonso da
Contemporanea : Revista de Comunica??o e Cultura , 2008,
Abstract: This article addresses, in a comparison method, the definition of the operational characteristics developed in the historic journey of wire services and how this scene can generate synchronized practices between the ambit of journalism and technology, resulting, for example, onto the web journalism. In a second time, we try to point some tendencies of research about the problem presented in thecurrent theoretical. After having identified these characteristics, we try to indicate the permanence and the balancing of all the activities of agencies with the range of possibilities provided by technological networks of information more flexible, open and participatory, as the Internet. Finally, we give scope for continuities, potentiations and breaks presented on this historical and technological journey, aswell as the importance and consequences to the area of the journalism in digital networks.
Estimativa de parametros genéticos sob duas estratégias de avalia??o em híbridos intra e interespecíficos de capim-elefante
Assis, Liz Carolina da Silva Lagos Cortes;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;Cunha, Márcio Vieira da;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001200005
Abstract: the objective of this work was to evaluate the genetic parameters estimated in intra and interespecific hybrid families of elephant grass under two evaluation strategies: per se and genetically stratified mass selection. ten families of intraespecifc hybrids and ten families of interespecific hybrids were used. the characteristics evaluated were the following: plant height, plant agronomic score, dry matter content and dry matter production. it was estimated, for genetic parameters, heritability in the wide sense, variance, genetic and experimental variation coefficient and genetic, phenotypic and environmental correlation. the experiment was evaluated in a random block design with three repetitions. greater genetic variability for the studied characteristics were observed among the interespecific hybrids of elephant grass and pearl millet in comparison to the intraespecifc hybrids of elephant grass. heritability showed higher percentages for per se strategy among the studied hybrids. genetically stratified mass selection is less effective in removing the environmental effects aiming at improving experimental precision.
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