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Search Results: 1 - 10 of 621441 matches for " Mércia Virginia Ferreira dos;Dubeux Júnior "
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Produtividade e composi o química de gramíneas tropicais na Zona da Mata de Pernambuco
Santos Mércia Virginia Ferreira dos,Dubeux Júnior José Carlos Batista,Silva Maria da Concei??o,Santos Stuart Francisco dos
Revista Brasileira de Zootecnia , 2003,
Abstract: O trabalho foi realizado com o objetivo de avaliar o potencial produtivo e a composi o química de cinco gramíneas tropicais (Pennisetum purpureum Schum. cv. Pioneiro, P. purpureum Schum cv. Mott; Panicum maximum Jacq. cv. Momba a, P. maximum Jacq cv. Tanzania e Brachiaria brizantha (Hochst) Stapf. cv. Marandu). Os cortes foram realizados em intervalos de 35 dias e a 40 cm do solo. O cultivar Pioneiro apresentou maior produ o de MS (7,35 t/ha/35 dias), quando comparado aos cultivares Mott (5,28 t/ha/35 dias) e Tanzania (5,23 t/ha/35 dias), n o diferindo dos demais. Brachiaria brizantha apresentou maior número de perfilhos totais (538,72/m2), entretanto o peso dos perfilhos axilares foi inferior ao dos demais cultivares. Os cultivares de P. purpureum apresentaram maior perfilhamento axilar e menor perfilhamento basal, quando comparados aos cultivares de P. maximum. Os teores de PB variaram de 6,96 a 10,2%, tendo o cultivar Pioneiro apresentado o maior valor. As análises de FDN e FDA n o evidenciaram diferen as entre as forrageiras avaliadas, obtendo-se valores médios de 73,83 e 39,20%, respectivamente. No intervalo de corte avaliado, as forrageiras apresentaram elevada propor o de folhas (> 80%), mostrando potencial para utiliza o em explora es pecuárias na Zona da Mata de Pernambuco.
Decomposi??o de serrapilheira em bosque de sabiá na Zona da Mata de Pernambuco
Freire, Joelma de Lira;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Ferreira, Rinaldo Luiz Caraciolo;Santos, Mércia Virginia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800006
Abstract: the research aimed to evaluate the decomposition of sabiá (mimosa caesalpiniifolia benth) litter fractions by using the nylon bag technique. the following litter fractions were incubated: senescent leaves, leaves at the beginning of mineralization, and branches with diameter up to 20 mm. incubation was performed during periods of 0, 4, 8, 16, 64, 100, and 256 days in 2006 and 2007. the fractions were distributed in a random block design with five replications. it was evaluated the disappearance of biomass, nitrogen (n), and phosphorus (p), concentrations of nitrogen and phosphorus and the carbon/ nitrogen ratio of litter during the periods of incubation. in general, the negative exponential model explained the disappearance of biomass, nitrogen, and phosphorus, however, there was a variation among years and, in some cases, despite of being significant, the models showed a low correlation between predicted and observed data. biomass disappearance rate was slow because only 30% of leaf biomass was mineralized after 256 days of incubation. net nitrogen mineralization showed large variation among years, and it differed among the studied fractions. nitrogen content of the litter increased, on average, until 32 days (leaves) and until 64 days (branches) of incubation followed by stabilization. the linear plateau model was used to explain that process. in the course of the incubation periods, the carbon/nitrogen ration decreased. despite of the high content of nitrogen, the decomposition of sabiá litter is slow, what might reduce the loss of nutrients in the forest, increasing its sustainability and reducing the possible deleterious effects to the environment.
Deposi??o e composi??o química de serrapilheira em um bosque de sabiá
Freire, Joelma de Lira;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Ferreira, Rinaldo Luiz Caraciolo;Santos, Mércia Virginia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800005
Abstract: this research aimed to evaluate the deposition and chemical composition of the components of the existing and deposited litter in a sabiá (mimosa caesalpiniifolia benth) canopy. the experiment was carried out from august 2006 to july 2007. the evaluation of the existing and deposited litter was performed every 28 days using 20 squares with 1m2 randomly allocated and new areas were chosen for each evaluation. the canopy showed plants with an average diameter of 26.8 cm at breast height. monthly deposition of organic matter of leaves and branches during the experimental period was 15,167 kg and 3,373 kg/ha, respectively, and it increased during the highest precipitation period, in a 0.30 relationship with the accumulation, indicating higher accumulation than deposition. leaf proportion was 87% of the total litter, with means of 2.9% of nitrogen and 0.17% of phosphorus. the carbon/nitrogen ratio of leaves was below 30, while carbon/nitrogen ratio of the branches ranged from 30 to 40, proving a better quality for leaves. during the experimental period, deposition of nitrogen through litter was approximately 462 kg/ha and 30 kg/ha for phosphorus. litter deposition is essential for maintenance of soil fertility in a sabiá canopy and it contributes for conservation and sustainability of the canopy.
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.
Efeitos da adi??o de vagens de algaroba sobre a composi??o química e a microbiota fúngica de silagens de capim-elefante
Batista, ?ngela Maria Vieira;Guim, Adriana;Souza, Iraci Saraiva;Lira, Krystyna Gourlach;Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000100001
Abstract: the objective of this trial was to evaluate the chemical composition and fungal microbiota of different proportions of elephantgrass and mesquite pod silages: 100:0, 67:33, 34:66, and 0:100, respectively. a complete randomized design with four replications per treatment was used. the material was ensiled in pvc silos and remained sealed during a 120-days period. after opening the silos, silage samples were collected followed by fungi isolation and identification and determination of the chemical composition of the silages. addition of mesquite pod to elephantgrass silage decreased linearly the contents of ndf, adf, and ash while the opposite was observed for dm. a total of 490 colony forming units (cfu) was isolated per gram of material and showed the following distribution: 68, 101, 261, and 58 cfu/g of silage, respectively, on 100:0, 67:33, 34:66, and 0:100 treatments. increasing the proportions of mesquite pod in the silo changed the fungi microbiota of the silages. for instance, in the treatment containing only mesquite pod silage, a greater diversity of fungi species was observed despite the lower number of cfu/g of material. conversely, the treatment with 66% of mesquite pod showed greater fungi growth and lesser fungi species variety.
Consumo de matéria seca e desempenho de novilhas das ra?as Girolando e Guzerá sob suplementa??o na caatinga, na época chuvosa, em Pernambuco, Brasil
Santana, Daniel Fernando Ydoyaga;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Ferreira, Marcelo de Andrade;Santos, Djalma Cordeiro dos;Mello, Alexandre Carneiro Le?o de;Dubeux Júnior, José Carlos Batista;Araujo, Gherman Garcia Leal de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001000007
Abstract: to estimate dry matter intake and to evaluate variation on live weight of heifers, an experiment was conducted from march to july 2003, with the following supplementation strategies: no supplementation (control), cottonseed cake (1 kg); spineless cactus (10 kg); spineless cactus + 0.5 kg of cottonseed cake (5 kg). dry matter intake of native pasture was not affected by supplementation, but it affected total dry matter intake. intake of total dry matter (dm) differed among breeds with values of 5.44 and 6.75 kg/day, respectively for guzerat and girolando breeds. for animal fed cottonseed cake supplementation, total dm intake was higher than in the control group (no supplementation), however, it was similar for those under spineless cactus and cottonseed cake + spinelles cactus supplementation. daily average body weight gain (517 and 434 g/animal, respectively, for girolando and guzerat groups) did not differ among breeds neither was affected by breed ? supplementation interaction. however, among strategies of suplementation, values were significantly different and they were 412, 620, 371 and 498 g/animal/day, respectively, for control and cottonseed cake suplementation group; spineless cactus; cottonseed cake + spineless cactus. in pernambuco semiarid, 1 kg of cottonseed cake supplementation improved daily average weight gain, regardless to breed of the animal during the rainy season.
Produtividade e composi??o química de gramíneas tropicais na Zona da Mata de Pernambuco
Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;Silva, Maria da Concei??o;Santos, Stuart Francisco dos;Ferreira, Rinaldo Luiz Caraciolo;Mello, Alexandre Carneiro Le?o de;Farias, Iderval;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2003, DOI: 10.1590/S1516-35982003000400006
Abstract: this work was carried out to evaluate the productive potencial and chemical composition of five grasses (pennisetum purpureum schum. cv. pioneiro, p. purpureum schum cv. mott; panicum maximum jacq. cv. momba?a, p. maximum jacq cv. tanzania, e brachiaria brizantha (hochst) stapf. cv. marandu). the cuts were performed at 35 days of intervals and 40 cm above ground. pioneiro showed higher dm yield (7.35 t dm/ha/35 days) when compared to the dwarf elephantgrass (5.28 t dm/ha/35 days) and tanzania grass (5.23 t dm/ha/35 days), being similar to the others. brachiaria brizantha presented the highest total tillering (538.72/m2) however the aerial tiller weight was the lowest for this species. the cultivars of p. purpureum showed higher aerial tillering and lower basal tillering, when compared to the cultivars of p. maximum. the cp concentration ranged from 6.96 to 10.20% and the cultivar pioneiro presented the highest value. no difference was found among the forages for ndf and adf, and the mean values were 73.83 and 39.20%, respectively. at the evaluated cut interval, the forages presented a high proportion of leaves (> 80%), showing potential to be used on livestock pasture-based operations in the forest zone of pernambuco.
Degrada??o ruminal da matéria seca de clones de capim-elefante em fun??o da rela??o folha/colmo
Mello, Alexandre Carneiro Le?o de;Lira, Mário de Andrade;Dubeux Júnior, José Carlos Batista;Santos, Mércia Virginia Ferreira dos;Ferreira, Rinaldo Luiz Caraciolo;Cunha, Márcio Vieira da;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000500009
Abstract: the objective of this work was to evaluate the influence of leaf/stem ratio (l/s) in the in situ dry matter degradability (isdmd) of elephantgrass clones. the experiment was carried out at ipa experimental station, in vitória de sto. ant?o, pe. two groups of elephantgrass clones were studied: group i (cameroon, mercker méxico, três rios, elefante de pinda and gua?u/iz), characterized by its high l/s ratio, and group ii (ce 08 a.d., taiwan a-25, goiano, ce 03 a.d. and merc.), with low l/s ratio. samples of whole plant harvested in the 60th day of growth in the dry period were dried and milled and incubated in the rumen of the two crossbred bovines for 0, 6, 12, 24, 48, 72 e 96 hours to determine the isdmd and ruminal fermentation parameters. the experimental design was randomized blocks in split-plot arrangement. there wasn't any significant difference between groups of elephantgrass as defined by their isdmd. the degradation characteristics averaged 79.40, 69.10, 26.90, 52.60, 20.60%, and 5.50%/h for potential degradability, effective degradability, soluble fraction, potentially degradable fraction, no degraded fraction, and degradation rate, respectively. the leaf/stem ratio did not influence the isdmd of elephantgrass clones.
Métodos de recupera??o de pastagens de Brachiaria decumbens Stapf. no Agreste Pernambucano
Ydoyaga, Daniel Fernando;Lira, Mário de Andrade;Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;Silva, Maria da Concei??o;Santos, Venézio Felipe dos;Fernandes, Ant?nio de Pádua Maranh?o;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000300010
Abstract: in order to identify methods of recuperation of degraded pastures in the agreste of pernambuco, an experiment was conducted in the fazenda riacho do papaguaio, municipial district of s?o jo?o. it was used a split-plot feature within a confounded randomized block design. the experimental treatments were four recovery managements (deferment, deferment + harrowing, deferment + harrowing + corn as a companion crop, deferment + corn as a companion crop), two levels of nitrogen (0 and 100 kg/ha of n), two levels of phosphorus (0 and 100 kg/ha of p2o5), totalizing 16 experimental treatments with three replications. the harvesting evaluation was taken after 138 days from implementation of the experimental treatments. a significant n and p2o5 interaction was observed with marked increase in forage dry matter mass corresponding to the combination of 100 kg/ha of n and p2o5. the deferment and deferment + corn treatments resulted in higher forage mass yield as compared to the harrowing ones. after 138 days of growth, there was an increase in the percentage of uncovered soil with plow use, while the opposite was true without the use of a plow. plowing did not demonstrate agronomic viability as a degraded pasture recuperation practice. allowing the pasture to rest for 138 days during the rainy season promoted its recuperation, primarily with the combined application of nitrogen and phosphate fertilizers. the recovery of nitrogen and phosphate fertilized brachiaria decumbens stapf. was associated with decrease of other species.
Variabilidade e herdabilidade de caracteres qualitativos relacionados à qualidade de forragem de clones de capim-elefante na Zona da Mata de Pernambuco
Silva, Ant?nio Luiz Cordeiro da;Santos, Mércia Virginia Ferreira dos;Ferreira, Rinaldo Luiz Caraciolo;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Cunha, Márcio Vieira da;Pereira, Antonio Vander;Araújo, Gherman Garcia Leal de;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000100006
Abstract: the objective of this research was to evaluate variability and heritability of quantitative traits related to forage quality of 32 clones of elephant grass (three local controls, from zona da mata de pernambuco, and the remaining from renace/cnpgl). a complete randomized design was used with additional controls and analyses of variance was applied by using the procedure of families with controls between rows. evaluation was performed during the dry period, at 60 days of growth. it was observed significant differences among clones for the traits acid detergent of leaf blade and stem organic matter, with means of 34.05 and 78.83%, respectively. in general, heritability of qualitative traits was low, including null values for crude protein and neutral detergent fiber of leaf blade and in vitro digestibility of dry matter of leaf blade and stem. chemical composition and digestibility of evaluated clones were similar. there are few possibilities of gain in selection for qualitative traits considering the low variability and heritability of the studied characters.
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