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Search Results: 1 - 10 of 383738 matches for " Carvalho Paulo César de Faccio "
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Ajuste da carga animal em experimentos de pastejo: uma nova proposta
Heringer, Ingrid;Carvalho, Paulo César de Faccio;
Ciência Rural , 2002, DOI: 10.1590/S0103-84782002000400021
Abstract: the variation in available forage mass is frequently observed in grazing experiments, conducted with fixed forage allowance. for better forage mass control, a new method is proposed to adjust stocking rate, based on forage mass and forage allowance, dry matter (dm) accumulation rate, herbage intake rate, and forage susceptible to refusal and lost parameters. this method was used in departamento de zootecnia, ufsm, in a pearl millet grazing experiment with different nitrogen levels (0, 150, 300, 450 and 600kg ha-1), intending to maintain a forage dm mass close to 2500kg ha-1 during the experimental period. the dm accumulation rate was evaluated every 28 days in grazing exclusion cages. the forage susceptible to be refused, evaluated in fixed quadrats, represented 33 to 57% of forage mass, being dependent on nitrogen levels and stocking rate. the used method was efficient in maintaining the intended forage mass, indicating its potential use in experiments aiming better control of the variables involved in plant-animal interface.
Ajuste da carga animal em experimentos de pastejo: uma nova proposta
Heringer Ingrid,Carvalho Paulo César de Faccio
Ciência Rural , 2002,
Abstract: A varia o na massa de forragem disponível é freqüentemente observada em experimentos de pastejo, conduzidos sob uma oferta de forragem fixa. Para um melhor controle da massa de forragem, prop e-se uma nova forma de ajuste da carga animal, baseada nos parametros massa e oferta de forragem, taxa de acúmulo e consumo de matéria seca (MS), e forragem passível de rejei o e perdida. Este método foi utilizado no Departamento de Zootecnia da UFSM, num experimento de pastejo em milheto sob doses de nitrogênio (0, 150, 300, 450 e 600kg ha-1), visando manter uma massa de forragem de 2500kg MS ha-1 durante o período de avalia o. A taxa de acúmulo de MS foi avaliada a cada 28 dias através de gaiolas de exclus o. O material passível de rejei o, medido em quadrados fixos, representou de 33 a 57% da massa de forragem, sendo dependente das doses de nitrogênio e da carga animal. O método utilizado foi eficiente na manuten o da massa de forragem pretendida, indicando a potencialidade do seu uso em experimentos em que se pretende um maior controle das variáveis envolvidas na interface planta-animal.
Produ??o de forragem e de gr?os de aveia branca sob pastejo
Bortolini, Patrícia Cambrussi;Moraes, Aníbal de;Carvalho, Paulo César de Faccio;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000700005
Abstract: to quantify defoliation effects resulting from several grazing periods with cattle on white oat (avena sativa l.) an experiment was run at experimental station of funda??o agrária de pesquisa agropecuária in guarapuava, paraná state, brazil, from april to november of 1999. the specific objectives were to evaluate potential forage and grain yield of white oat cv. fapa 2 after different grazing periods as well as to identify the maximum weeks of grazing so as to yield good forage animal grazing without reducing grain yield. in a split plot experimental design 9 treatments with 3 replications were used. the treatments were: no grazing and grazing periods of 1, 2, 3, 4, 5, 6, 7 and 8 weeks. the white oat showed good leaf area recovery after grazing resulting in high dry matter yield provided that grazing period did not last more than 4 weeks. grazing periods from 1 to 4 weeks allowed grain yield increase as a result of lower apical meristem height and lower number of lodged plants. from 5 to 8 weeks of grazing defoliations the grain yield reduction was the result of reduced spike number per area, reduced spikelets number per spike and reduced grain number per spike. controlled grazing up to 4 weeks duration for white oat resulted in a good dry matter production which allowed animal and grain production, demonstrating that this cultivar have high potential for double purpose use.
Diferentes métodos de controle de plantas indesejáveis em pastagem nativa
Pellegrini, Luiz Giovani de;Nabinger, Carlos;Carvalho, Paulo César de Faccio;Neumann, Mikael;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000600005
Abstract: the study was conducted in a representative native pasture area in the transition between the serra do sudeste and depress?o central of rs. the main undesirable species were represented by: carqueja (baccharis trimera (less.) dc.), caraguatá (eryngium horridum (spreng.) less.) and alecrim (vernonia nudiflora less). it was evaluated the initial effect (until 60 days after application) of two methods of controlling undesirable plants on forage production, vegetation dynamics, and control efficiency: t1 - without control (control, sc), t2 - mechanical control (mechanic control, cm) and t3 - chemical control (commercial herbicide composed by picloram (64 g/l) + 2.4-d (240 g/l), in the dosage of 5 l commercial product/ha, cq). the treatments were organized in a complete block design, with four replications. there were no differences among treatments for the green dry matter of grasses and total dm. the forage legume biomass differed among treatments, with values of 587.9, 472.0 and 0 kg/ha of dm in the cm, cq and sq, respectively. the control efficiency of undesirable species in this study was 76.2% for cq and 27.9% for cm when compared to sc. the species control efficiency, in terms of frequency of pasture components, showed that the cm treatment was not efficient at 60 days after treatment application in the control of vernonia nudiflora (alecrim) in the second touch (-27.7%) and eryngium horridum (caraguatá) in the first touch (-30.0%).
Atributos químicos do solo em fun??o da aplica??o superficial de calcário em sistema de integra??o lavoura-pecuária submetido a press?es de pastejo em plantio direto
Flores, Jo?o Paulo Cassol;Cassol, Luis César;Anghinoni, Ibanor;Carvalho, Paulo César de Faccio;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000600017
Abstract: the use of large areas occupied only with winter soil cover crops for cattle grazing may become an alternative income source for summer grain producers in southern brazil. the presence of cattle in areas used only with no tillage crops may, however, affect soil attributes, depending on the management type. this study aimed to evaluate the effects of surface liming on the chemical attributes of a red latosol (oxisol) under no-tillage and crop-livestock integration. treatments consisted of pasture management at different heights (10, 20, 30 and 40 cm), in addition to areas without grazing, during the winter. in december 2001, the soil (layers of 0-25, 2.5-5, 5-7,5, 7,5-10, 10-12,5, 12,5-15, 15-17,5, 17,5-20 and 20-25 cm) was evaluated for chemical properties after the first grazing cycle. thereafter, 4.5 mg ha-1 limestone (62 % effective neutralization value) was broadcast and left on soil surface and soybean grown in succession to grazing. soil samples were colleted at the end of the first, second, third, fourth and fifth soybean growing seasons, corresponding to 6, 12, 24, 36, and 48 months after liming. the following variables were evaluated: ph-h2o, smp, exchangeable ca, mg, k and al, and total organic carbon (toc). the surface lime application was effective in correcting the acidity to a depth of 25 cm, depending on the attribute and variable over time. the presence of cattle grazing in the area increased the depth effect of liming. the input of different residues to the soil did not affect the toc levels.
Cereais de inverno submetidos ao corte no sistema de duplo propósito
Bortolini, Patrícia Cambrussi;Sandini, Itacir;Carvalho, Paulo César Faccio;Moraes, Aníbal de;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000100007
Abstract: the winter cereals utilization in double purpose system allows to provide forage in critical food conditions periods and also to increase the income of production stablility by improving quality and produtivity of winter cereal grains. the experiment was conducted from april 1994 to september 1996, in guarapuava, paraná, to evaluate the potential for forage and grains of white oat (avena sativa l.), wheat (triticum aestivum), triticale (x. triticosecale witt.), black oat (avena strigosa schreb), rye (secale cereale l.) and barley (hordeum vulgare l.), seeking an use in conditions of double purpose. a randomized block experiment design, with treatments assigned to subdivided portions, in three replications, was used. in the plots the production systems (without cut, one and two cut) were studied and in the sub-plot, the genotypes. the two cut system was superior than the others concerning the dry matter, mainly the oat. for the grain yield, the systems without cut and one cut were superior, in spite of the greatest production of oat genotype under two cut. in all genotypes, the hectoliter weight increased and the mass of a thousand seeds decreased, when cuts were performed. under apropriate handling conditions, considerable forage production can be reached, without affecting the posterior production of grains for winter cereals.
Fluxo de biomassa em pastagem de azevém anual (Lolium multiflorum Lam.) manejada em diferentes alturas
Pontes, Laíse da Silveira;Carvalho, Paulo César de Faccio;Nabinger, Carlos;Soares, André Brugnara;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000300002
Abstract: in an italian ryegrass pasture under continuous stocking with sheep, biomass flows were estimated from 2 to 20 october 1999. treatments corresponded to four different sward heights (5, 10, 15 and 20 cm) maintained by variable stocking. the experimental design was the randomized complete block design with three replicates. the fluxes were defined by morphogenetic and structural variables obtained from measurements performed on marked tillers. during the period in which the intended sward heights were established, significant effects in sward structure resulted in alterations on the biomass fluxes. the growth and intake fluxes showed a quadratic response with maximum values between 10 and 15 cm grazing heights, while the senescence flux increased linearly with sward height. maximum daily live weight gain and animal yield per hectare were obtained within this interval, indicating this interval being the most appropriate to pasture management. the evaluation period was coincident with the floral induction phase, so the leaf lamina mass was progressively smaller and biomass fluxes showed a negative balance for all treatments.
Avalia o do desempenho animal e do pasto na mistura aveia IAPAR 61 (Avena strigosa Schreb) e ervilha forrageira (Pisum arvense L.) manejada em diferentes alturas
Grise Marcia Maria,Cecato Ulysses,Moraes Anibal de,Faccio Paulo César Carvalho
Revista Brasileira de Zootecnia , 2002,
Abstract: O objetivo do trabalho foi avaliar o efeito de diferentes alturas (8,9; 10,0; 11,3; 11,9; 13,4; 13,6; 14,7; e 18,3 cm) na mistura de aveia cv IAPAR 61 (Avena strigosa Schreb) + ervilha forrageira (Pisum arvense L.) sobre o ganho médio diário (GMD), o ganho de peso vivo (GPV/ha), número de animais.dia, composi o botanica, resíduo de MS e porcentagem de solo descoberto. Utilizaram-se novilhos nelore, em pastejo, com lota es variáveis. As alturas do pasto foram mantidas usando-se o disco medidor, com ajustes de carga animal, semanalmente. O GMD variou de 0,497 a 1,017 kg/animal/dia, nas alturas de 8,9 e 18,3 cm, respectivamente, apresentando efeito linear em fun o do aumento da altura do pasto. N o houve efeito das alturas do pasto no GPV/ha e número de animais.dia/ha. O GPV/ha oscilou entre 127 e 356 kg/ha a 8,92 e 18,3 cm do pasto, a lota o variou de 184 à 424 animais.dia/ha nas alturas de 14,7 e 10,0 cm, respectivamente. O nível de resíduo de matéria seca/ha aumentou linearmente com o incremento da altura do pasto, na pastagem avaliada pelo método de DISCO. A aveia permaneceu dominante na composi o botanica do pasto representando 99,69%, enquanto que a ervilha contribuiu com 0,31% da mesma. A percentagem de solo descoberto foi decrescente à medida que se aumentou a altura do pasto. Esses resultados evidenciam que resíduos de MS superior a 18 cm s o importantes para o desempenho animal e para a produ o da pastagem.
Métodos e intensidades de pastejo na carga parasitária de cordeiros Methods and intensities of grazing in parasite load of lambs
Cristina Maria Pacheco Barbosa,Paulo César de Faccio Carvalho,Edna Nunes Gon?alves,Thais Devincenzi
Revista Brasileira de Saúde e Produ??o Animal , 2011,
Abstract: Objetivou-se avaliar o efeito do manejo da pastagem de azevém (Lolium multiflorum Lam.) sobre o risco de infec o parasitária. Foram utilizadas duas intensidades de pastejo (moderada e baixa) e dois métodos de pastejo (lota o contínua e rotacionada) durante 113 dias. O delineamento experimental foi o de blocos casualizados, em esquema fatorial 2 × 2 × 4 com quatro repeti es. N o houve intera o métodos × intensidades de pastejo e, portanto, seus efeitos foram analisados de forma independente. O método de pastejo de lota o contínua apresentou maior recupera o de larvas infectantes na pastagem ao longo do período experimental e menor carga parasitária nos animais. As intensidades de pastejo n o apresentaram diferen as no número de larvas recuperadas na pastagem nem no grau de infec o dos animais. Esses resultados indicaram que sob lota o contínua os animais tiveram uma maior oportunidade de sele o de onde pastejar, o que provavelmente resultou em uma menor ingest o de larvas. This study aimed to evaluate the effect of rye grassfield management (Lolium multiflorum Lam.) on parasite reinfection of lambs. Two grazing intensities (moderate and low) and two grazing methods (continuous and rotational stocking) were used, in total of 113 days. Experimental design included factorial arrangement (2 x 2 x 4 replicates), in a complete randomized block. There was no interaction between methods and intensities of grazing, and therefore, their effects were analized separately. Continuous grazing methods had higher incidence of L3 parasites larvae in the field, but lower parasite load in each animal. There was no significat difference between grazing intensities and number of L3 larvae in the fields, or level of parasite loads. These results showed that under continuous stocking the lambs had a better opportunity to select the grazing place, which probably resulted in a lower intake of larvae.
Efeito de métodos e intensidades de pastejo sobre a ressemeadura natural de azevém anual = Effect of grazing methods and intensities on annual ryegrass under natural reseedling
Cristina Maria Pacheco Barbosa,Paulo César de Faccio Carvalho,Guilherme Fernandes Cauduro,Thais Devincenzi
Acta Scientiarum : Animal Sciences , 2008,
Abstract: Este trabalho foi conduzido na E.E.A da UFRGS/RS (30°05’S e 51°39’W) com o objetivo de avaliar o efeito de métodos e intensidades de pastejo na dinamica populacional de azevém (Lolium multiflorum Lam.) em ressemeadura natural. Conduziu-se a pastagem em dois métodos de pastejo (lota o contínua e rotacionada) e duas intensidades de pastejo (moderada e baixa), em um delineamento em blocos casualizados, em esquema fatorial com três repeti es (2x2x3). No ano seguinte, após um ciclo de lavoura de soja no ver o, foi contado o número de perfilhos de azevém estabelecidos via essemeadura natural. Os resultados demonstraram n o ter havido intera o (p > 0,05) entre os métodos e as intensidades de pastejo, e seus efeitos foram analisados de forma independente. Enquanto os diferentes métodos de pastejo n o afetaram a ressemeadura do azevém (p = 0,4636), asdiferentes intensidades de pastejo a influenciaram significativamente (p = 0,0003). O número de perfilhos de azevém estabelecidos via ressemeadura natural, na intensidade de pastejo baixa, foi maior (6.776 perfilhos m-2) do que na intensidade de pastejo moderada(211 perfilhos m-2). O controle da intensidade de pastejo é um fator determinante para a manuten o do azevém em sistemas de produ o baseados na persistência dessa forrageira via ressemeadura natural. This work was conducted at EEA/UFRGS, in Eldorado do Sul, RioGrande do Sul state, Brazil (30°05’S e 51°39’W), to evaluate the effects of different grazing intensities and methods on the population dynamics of ryegrass (Lolium multiflorum Lam.) under natural reseedling. Two grazing intensities (moderate and low) were used, under continuous and rotational grazing. The experimental design included randomized blocks with 2x2x3 factorial arrangements (2 grazing intensities x 2 grazing methods x 3 replicates).The following year, the fields were desiccated with herbicides and a soybean plant crop cycle was established during the summer season. Ryegrass tillers from natural reseedling were counted after the soybean harvest. There was no interaction (p > 0.05) betweengrazing intensities and methods, and the effects for each treatment were independently analyzed. While the grazing methods did not affect natural ryegrass reseedling (p = 0.4636), there were significant effects under different grazing intensities (p = 0.0003). The numberof ryegrass tillers established by natural reseedling under low grazing intensity (6,776 tillers m-2) was much higher than under moderate grazing intensity (211 tillers m-2). Grazing intensity is a key factor to maintain ryegrass producti
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