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Registros recuperados: 31
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Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid Genet. Mol. Biol.
Mendes-Bonato,Andréa Beatriz; Pagliarini,Maria Suely; Valle,Cacilda Borges do.
This paper reports a case of abnormal spindle orientation during microsporogenesis in an interspecific hybrid of the tropical grass Brachiaria. In the affected plant, prophase I was normal. In metaphase I, bivalents were regularly co-oriented but distantly positioned and spread over the equatorial plate. In anaphase I, chromosomes failed to converge into focused poles due to parallel spindle fibers. As a consequence, in telophase I, an elongated nucleus or several micronuclei were observed in each pole. In the second division, the behavior was the same, leading to polyads with several micronuclei. A total of 40% of meiotic products were affected. The use of this hybrid in production systems needing good-quality seeds is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria; Interspecific hybrid; Meiosis; Spindle abnormality; Tropical grass.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100023
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Adaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns. Repositório Alice
SANTOS, P. M.; THORNTON, B.; CORSI, M..
Dry mass production and persistence of Panicum maximum pastures depends on nitrogen supply. Defoliation influences N uptake and allocation patterns yet its effects on plasticity of N dynamics in P. maximum have not been investigated. Stable isotopes of N (15N) were used in order to test the hypothesis that defoliation in terms of proportion of the leaf area removed effects N mobilisation, uptake and allocation patterns in P. maximum. The plants were initially cut weekly to a height of either 0.15 m or 0.30 m for seven weeks. Eight weeks after the first defoliation, all plants were defoliated for a final time to remove 0, 25, 50, 75 or 100 % of the area of each individual leaf blade of the main tiller. Root N uptake was reduced when all leaf area was...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Clipping height; Guineagrass; Organic reserves; Regrowth; Tropical grass.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/930067
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Adaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns Scientia Agricola
Santos,Patricia Menezes; Thornton,Barry; Corsi,Moacyr.
Dry mass production and persistence of Panicum maximum pastures depends on nitrogen supply. Defoliation influences N uptake and allocation patterns yet its effects on plasticity of N dynamics in P. maximum have not been investigated. Stable isotopes of N (15N) were used in order to test the hypothesis that defoliation in terms of proportion of the leaf area removed effects N mobilisation, uptake and allocation patterns in P. maximum. The plants were initially cut weekly to a height of either 0.15 m or 0.30 m for seven weeks. Eight weeks after the first defoliation, all plants were defoliated for a final time to remove 0, 25, 50, 75 or 100 % of the area of each individual leaf blade of the main tiller. Root N uptake was reduced when all leaf area was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clipping height; Guineagrass; Organic reserves; Regrowth; Tropical grass.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500002
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Animal production and canopy attributes of Cynodon pasture managed under continuous stocking with wethers at three levels of forage allowance R. Bras. Zootec.
Santos,Márcia Vendrúsculo dos; Kozloski,Gilberto Vilmar; Quadros,Fernando Luiz Ferreira de; Pires,Cleber Cassol; Wommer,Tatiana Pfüller; Mônego,Camila Ornelas.
The objective of the present experiment was to evaluate the effect of forage allowance (3, 6 or 9 kg of green leaves dry matter (DM)/100 kg of body weight (BW)) on both animal performance and attributes of Cynodon dactylon var.dactylon canopy managed under continuous stocking by wethers. The study was carried out with 27 Polwarth wethers throughout five 28-day periods, in a completely randomized experiment, which included three paddocks per treatment and three tester animals per paddock. Forage mass varied from 2878 to 6580 kg of DM/ha and was directly related to forage allowance. Leaves proportion (mean of 23%) and leaves growth rate (mean of 25 kg of DM/ha/day) varied between experimental periods in a similar rate for all treatments. Stocking rate varied...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cynodon dactylon var. dactylon; Growth rate; Intake; Live weight gain; Sheep; Tropical grass.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000100026
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Animal production in Tanzania grass swards fertilized with nitrogen R. Bras. Zootec.
Canto,Marcos Weber do; Bona Filho,Amadeu; Moraes,Aníbal de; Hoeschl,André Ricardo; Gasparino,Eliane.
Nitrogen (N) at 100, 200, 300, and 400 kg ha-1 was applied to Tanzania grass swards to evaluate the animal response and relationships between sward characteristics and the performance of young Nellore bulls (Bos indicus) under continuous stocking. A completely randomized experimental design was used with two replications between 11 November 2001 and 15 April 2002 when the sward heights were maintained at 60 cm by using different stocking rates. The average daily gain (ADG) (0.73 kg d-1) was not affected by N doses while the number of animal days ha-1 increased linearly from 515 to 1267. On the other hand, the linear increase in the animal yield was 399, 653, 755, and 895 kg ha-1 for N at 100, 200, 300, and 400 kg ha-1, respectively, while the ratio between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal performance; Nitrogen fertilization; Panicum maximum; Tropical grass.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700003
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Climate change and future scenarios for palisade grass production in the state of São Paulo, Brazil. Repositório Alice
ANDRADE, A. S.; SANTOS, P. M.; PEZZOPANE, J. R. M.; COARACY, G. M. B.; EVANGELISTA, S. R. M..
2014
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Brachiaria brizantha; Urochloa brizantha; Empirical model; ETA; Precis; Tropical grass.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1003547
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Dry matter yield of promising Panicum maximum genotypes in response to phosphorus and lime on Brazilian savanna. Repositório Alice
BRAGA, G. J.; MACIEL, G. A.; RAMOS, A. K. B.; CARVALHO, M. A.; FERNANDES, F. D.; JANK, L..
Soil fertility of the Brazilian savanna (Cerrado) is natu-rally poor. Extensive areas of pastures located in the central part of the territory are cultivated with Brachiaria grasses, which are less demanding for soil nutrients and lime than other species (Rao et al. 1998). On the other hand, Panicum maximum cultivars, such as the high yielding Mombaça grass recommended for intensive beef and dairy cattle systems (Euclides et al. 2008), must be seeded with a higher amount of fertilizer, especially phosphorus (P). Consequently, an effort is underway to select P. maximum genotypes with low P demand and high responsiveness. The objective of this study was to evaluate dry matter yields of genotypes of P. maximum in response to doses of P and lime in the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Capim tropical; Campim colonião; Tropical grass; Cerrado; Fertilizante; Pastagem; Fertilizers; Megathyrsus maximus; Pastures.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1088041
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Efeito da altura e do intervalo de corte do capim-elefante-anao. II Composicao mineral da forragem. Repositório Alice
ACUNHA, J.B.V.; COELHO, R.W..
O presente experimento teve por objetivo determinar o efeito da altura e do intervalo de corte sobre a composicao de Ca, P. K e Mg do capim-elefante-anao cv. Mott. O trabalho foi conduzido em areas pertencentes ao Centro de Pesquisa Agropecuaria de Clima Temperado, Embrapa-CPACT, em Pelotas-RS, no periodo de novembro de 1992 a abril de 1993. O delineamento experimental utilizado foi o completamente casualizado com parcelas divididas e tres repeticoes. Os tratamentos foram representados por tres alturas de corte (5, 10 e 15cm acima do nivel do solo) - parcelas -, e cinco intervalos de corte (28,56,84,112 e 140 dias) - subparcelas. A graminea fornece forragem de valor nutritivo compativel com as exigencias minimas dos bovinos (novilhos nas fases de recria...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pennisetum purpureum; Graminea tropical; Teores de calcio; Fosforo; Potassio; Magnesio; Tropical grass.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89459
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Efeito da altura e intervalo de corte do capim-elefante-anao. I. Producao e qualidade da forragem. Repositório Alice
ACUNHA, J.B.V.; COELHO, P.W..
O experimento foi conduzido em area pertencente a EMBRAPA-Centro de Pesquisa Agropecuaria de Clima Temperado (CPACT), Pelotas, RS , no periodo de novembro de 1992 a abril de 1993, com o objetivo de estudar o efeito da altura e do intervalo de corte sobre a producao e qualidade do capim-elefante-anao cv. Mott. Utilizou-se o delineamento completamente casualizado, com parcelas divididas em tres repeticoes. As parcelas corresponderam as alturas de corte (5,1 e 15 cm acima do nivel do solo), e as subparcelas, aos intervalos de corte (28,56,84,112 e 140 dias). A analise dos resultados obtidos permitiu concluir que o intervalo de corte de 56 dias e o mais indicado para utilizacao animal, independentemente da altura de corte, na qual nao foi detectada...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pennisetum purpureum; Graminea tropical; Relacao folha/caule; Proteina bruta; Digestibilidade; Tropical grass; Leaf/stem ratio; Crude protein; Digestibility.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89460
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Efeito do fosforo suplementar sobre o desempenho reprodutivo de vacas de corte em pastagem de Brachiaria humidicola. Repositório Alice
STHIAGO. L.R.L.; MORAES, S. da S.; NICODEMO, M.L.F.; ROSA, I.V.; BRORING, N..
O objetivo deste experimento foi observar e quantificar o efeito de duas misturas minerais (ad libitum), uma sem (M) e outra com fosforo suplementar (MP), sobre o desempenho produtivo e reprodutivo de vacas de cria neloradas em pastejo de Brachiaria humidicola. O trabalho foi realizado na Fazenda Modelo (Embrapa-Centro Nacional de Pesquisa de Gado de Corte), localizada em terrenos, MS, em duas fases, a primeira, em 1988/92, e a segunda, 1992/94. Na segunda fase reduziu-se a carga animal durante a seca e os dias de amamentacao (de 1,0 para 0,5 vacas/ha e de 210 para 90 dias, respectivamente). Foram realizadas medidas de consumo da mistura mineral (M=76 e MP=112 g/cab./dia); teor medio de fosforo na forrageira (epoca das chuvas = 0,16%, epoca seca = 0,11%);...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cria; Nutricao; Mineral; Vaca de corte; Graminea tropical; Reproducao; Cerrado; Breeding; Nutrition; Tropical grass; Reproduction.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/handle/doc/101308
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Effect of phosphorous levels during establishment of Paspalum regnellii cv. BRS Guará. Repositório Alice
SILVA, K. C. da; COSSALTER, S. de T.; REGANASSI, R. C. T.; PEZZZOPANE, C. de G.; AZENHA, M. V.; BELONI, T.; SANTOS, P. M..
2016
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Paspalum; Plant nutrition; Tropical grass; Nutrição vegetal; Paspalum.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1055653
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Fermentative and microbiological profile of marandu-grass ensiled with citrus pulp pellets Scientia Agricola
Bernardes,Thiago Fernandes; Reis,Ricardo Andrade; Moreira,Andréia Luciane.
High-wet roughages with low content of soluble carbohydrates, such as tropical grasses, should be inappropriate for producing silages of adequate quality. This study aimed to evaluate the fermentative and microbiological profiles of Marandu-grass ensilaged with pelleted citric pulp (PCP). Brachiaria brizantha (Hochst ex. A. Rich) Stapf cv. Marandu with 58 days of vegetative growth was harvested for producing experimental silages in PVC silos provided with Bünsen valves and density capacity of 900 kg m-3. Treatments were three PCP levels (0, 50 and 100 g kg-1 of fresh forage) and seven times (1, 4, 7, 14, 21, 28 and 56 days) after sealing. PCP inclusion increased soluble carbohydrate concentrations by 15 to 20% and reduced pH (5.3 to 4.2) and N-NH3 levels...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Additive; Bacteria; Fermentation; Tropical grass; Silage.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300003
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Forage mass production and grazing loss of sorghum hybrid in response to the density of the sowing and the spacing between planting lines R. Bras. Zootec.
Simili,Flávia Fernanda; Lima,Maria Lúcia Pereira; Moreira,Andréia Luciane; Soares,Paulo Victória; Roma Júnior,Luiz Carlos; Reis,Ricardo Andrade.
The objective of this experiment was to evaluate dry matter yield and loss of grazing due to animal trampling in response to sowing density and spacing between lines in the planting. Sorghum hybrid 1P400 was submitted to six treatments, composed of three sowing density combinations (12; 16 and 20 kg/ha of seeds) and two spacing between lines (0.40 and 0.80 m). Sorghum hybrid 1P400 was sowed in two seasons, at the end of spring (December 3rd, 2005) and the other at the end of summer (March 20th, 2006). Cultivation strategies influenced plant population in the two experimental seasons. Diameter of the stem in season 1 decreased with density increase, whereas in the second season, interaction between sowing density and spacing was significant. In the first...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cattle trampling; Sorghum bicolor × Sorghum sudanense; Summer annual grass; Tropical grass.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000700011
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In situ degradability of corn stover and elephant-grass harvested at four stages of maturity Scientia Agricola
Silva,Luis Felipe Prada e; Cassoli,Laerte Dagher; Roma Júnior,Luiz Carlos; Rodrigues,Ana Carolina de Oliveira; Machado,Paulo Fernando.
Among tropical forages, corn silage is largely used by farmers trying to explore the maximum genetic potential from the animals. However, other tropical forages, such as elephant-grass (Pennisetum purpureum), are more productive and therefore cheaper to use than corn silage. Our objective was to compare the in situ degradability of elephant-grass with that from corn hybrids, all harvested at four stages of maturity. The experimental design followed a randomized block design with nested subplots. Two corn hybrids: AG5011, ZN8392 were harvested with 25, 30, 35, and 40% dry matter (DM) in the whole plant, and separated in stem + leaf sheath + leaf blade (stover), and cobs. Elephant-grass was harvested with 30, 40, 50 and 60 days after a leveling cut. Dried...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pennisetum purpureum; Corn silage; Digestibility; Rumen; Tropical grass.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600005
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In situ degradability of marando palisadegrass in grazing cows supplemented or not with soybean oil. Repositório Alice
SALMAN, A. K.; CRUZ, P . G. da; FARIA, F. R.; SOUSA, E. C. de; CARVALHO, G. A. de; CASTILHO, L. da S. O.; BERNARDO, V. R.; SCHMITT, E..
O objetivo deste trabalho foi avaliar a degradação in situ de matéria seca (MS) de palisadegrand marandu em vacas de pastagem não suplementado ou suplementado com concentrado ou óleo de soja.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Rumen degradation; Dairy cattle; Tropical grass.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1075055
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In situ degradation kinetic of Andropogon gayanus grass silages harvested at three stages of maturity. Repositório Alice
RIBEIRO JÚNIOR, G. de O.; VELASCO, F. O.; FARIA JÚNIOR, W. G. de; TEIXEIRA, A. de M.; MACHADO, F. S.; MAGALHÃES, F. A.; JAYME, D. G.; GONÇALVES, L. C..
2014
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Gamba grass; Maturity; Preserved forage; Ruminal degradability; Tropical grass.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1013820
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Leaf photosynthesis and water use efficiency by Panicum maximum BRS Quênia. Repositório Alice
ARAGÃO, L. S.; ASSIS, H. F.; CAVALLI, J.; TESK, C. R. M.; CARVALHO, P.; PEREIRA, D. H.; SCHIMITD JUNIOR, R. J.; PEDREIRA, B. C. e.
Tropical grasses has an important role at forage-based cattle production systems. To guarantee production is necessary understand factors that allow plant growth, as well as photosynthesis. Under grazing, the amount of residual leaf area in post-grazing or plant organic reserves also driven the growth. Thus, gaseous exchange responses in forages are essential for understand forage production process, aiming maximum biological efficiency. The objective with this study was to evaluate foliar photosynthesis and water use efficiency in Quênia (Panicum maximum BRS Quênia). The pastures were submitted to intermittent grazing (95% of light interception) with two grazing intensities defined by post-grazing height: high and low (20 and 35 cm). The experiment was...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Light interception; Grazing intensity; Grazing management; Tropical grass.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1086320
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Losses through gases and effluent and nutritional value of Brachiaria decumbens with addition of soybean hulls R. Bras. Zootec.
Dantas,Carlos Clayton Oliveira; Zanine,Anderson de Moura; Souza,Alexandre Lima de; Cabral,Luciano da Silva; Negrão,Fagton de Mattos; Santos,Edson Mauro; Ferreira,Daniele de Jesus.
The objective of this experiment was to evaluate the losses of nutrient through gases and effluents, the nutrient recovery, fermentation parameters and the chemical parameters of silages of Brachiaria decumbens with the addition of soybean hulls, testing five levels of inclusion: 0, 10, 20, 30 and 40% (as is), with five replications per treatment. After the standardization cut of the forage, performed at 5 cm from the soil level, the soil was fertilized with nitrogen and potassium in the form of ammonium sulfate and potassium chloride, respectively, at 60 kg/ha. After 60 days, the grass was cut at 10 cm from the soil and ensiled. Experimental silos with capacity of 10 liters with Bunsen valve were used. Silos had 3 kg of sand conditioned at the bottom for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Byproduct; Conservation; Ensilage; Tropical grass.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500225
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Nutritional evaluation of elephant-grass silages with byproduct of annato R. Bras. Zootec.
Rêgo,Margareth Maria Teles; Neiva,José Neuman Miranda; Rêgo,Aníbal Coutinho do; Cândido,Magno José Duarte; Clementino,Rossana Herculano; Restle,João.
The objective of the present study was to evaluate the nutritional value of elephant-grass silages containing annato byproduct. Twenty intact rams were distributed in a complete randomized block design with five diets (0; 4; 8; 12 and 16% annato byproduct in the silage) and four replications and used to estimate the intake, apparent nutrient digestibility, content of total digestible nutrients and nitrogen balance. The addition of annato byproduct raised the intakes of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), ether extract (EE), total carbohydrates (TC), non-fibrous carbohydrates (NFC) and total digestible nutrients (TDN), in body weight (%BW) and in metabolic weight (g...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ensilage; Nutritive value; Pennisetum purpureum; Tropical grass.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000026
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Parameterization of the APSIM model for simulating palisadegrass growth under continuous stocking in monoculture and in a silvopastoral system. Repositório Alice
GOMES, F. J.; BOSI, C.; PEDREIRA, B. C. e; SANTOS, P. M.; PEDREIRA, C. G. S..
Sustainable intensification of livestock production systems has become a global demand. In silvopastoral systems, contrasting shading levels caused by the presence of trees interferes in the productive responses of the pasture under grazing. The environment in which plants develop in a pasture canopy is dynamic and complex due to the nature of soil-plant-animal interactions. These dynamic aspects can be rationalized, evaluated, and explained using mathematical modeling. The objective of the present study was to parameterize the APSIMTropical Pasture model to simulate palisadegrass [Brachiaria brizantha (Hochst A Rich) Stapf, syn. Urochloa brizantha] growth under continuous stocking and variable stocking rate, in a full sun system and in contrasting shading...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Agricultural systems modeling; Tropical grass; Forest livestock integration; Brachiaria brizantha cv Marandu; APSIM Tropical Pasture; Agroforestry.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1123142
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