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Search Results: 1 - 10 of 115239 matches for " José Carlos Batista;Lira "
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Repetibilidade de variáveis produtivas e qualitativas da forragem e da excreta bovina em pastagem de braquiária
Teixeira, Vicente Imbroisi;Dubeux Jr., José Carlos Batista;Mello, Alexandre Carneiro Le?o de;Lira Jr., Mário de Andrade;Lira, Mario de Andrade;Saraiva, Felipe Martins;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011000600012
Abstract: the objective of this work was to determine the repeatability and the number of the required evaluations to obtain determination coefficient greater than 90% in the productive and qualitative variables of forage and cattle excreta on a signal grass (urochloa decumbens) pasture. the utilized variables were: fecal production, feces mineral composition, herbage mineral composition around dung pads, feces biometry, herbage mass and herbage rejection around dung pads, urinary volume, and urine chemical composition. a fixed rotational stocking was used, with three days of occupation and 32 or 67 days of resting period, during the rainy and dry seasons, respectively. repeatability analyzes were obtained with the software genes, using the principal component method based on the covariance. the repeatability coefficients (r) had high estimates, and the r2 were equal to or greater than 90%, except for herbage mass at 20-40 cm, for the difference between pre-and post-grazing herbage height of herbage grown on dung pad, and for nitrogen concentration in the urine for the treatment with 3,2 animal units per hectare (r<0.50). for r2 above 90%, the number of evaluations required would be 11, 9, and 9, for the variables forage, feces, and urine, respectively.
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.
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.
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.
Avalia??o de clones de capim-elefante (Pennisetum purpureum Schum.) e de um híbrido com o milheto (Pennisetum glaucum (L.) R. Br.) submetidos a estresse hídrico. 1. Parametros morfológicos
Barreto, Glesser Porto;Lira, Mário de Andrade;Santos, Mércia Virgínia Ferreira dos;Dubeux Júnior, José Carlos Batista;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000100001
Abstract: this trial was carried out to evaluate the morphological characteristics of three elephant grass clones (cameroon, roxo de botucatu and mott) and an elephant grass with pearl millet hybrid (hv-241) submitted to two humidity regimes (with and without water stress). a randomized block design with split plots and three replicates was used. in the main plot, the effect of the humidity regimes was studied, and in the split plot, the different clones. plants submitted to water stress showed lower height, and none of them showed internodes above cutting height (10 cm). as a result of water stress, the plant height reductions were 42.7% (cameroon), 35.05% (roxo de botucatu), 28.54% (hybrid hv-241) and 27.43% (mott). leaf blade length was reduced from 69.9 cm, in the wet treatment, to 50.0 cm in those submitted to water stress, whereas leaf blade width average of water stress plants was less than a half of that in wet treatment plants. water stress did not disturb tillering of cultivars but, in hv-241 hybrid, it reduced both the number of lateral tillers/plant and total number of tillers/plant. in both humidity regimes, hybrid hv-241 was the clone, which showed the largest tillering. it was observed that, except for tillering of cultivars, water stress promoted a reduction on the other morphologic studied parameters.
Avalia??o de clones de capim-elefante (Pennisetum purpureum Schum.) e de um híbrido com o milheto (Pennisetum glaucum (L.) R. Br.) submetidos a estresse hídrico. 2. Valor nutritivo
Barreto, Glesser Porto;Lira, Mário de Andrade;Santos, Mércia Virgínia Ferreira dos;Dubeux Júnior, José Carlos Batista;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000100002
Abstract: this trial aimed to study the nutritive value of three elephant grass clones (cameroon, roxo de botucatu and mott) and an elephant grass with pearl millet hybrid (hv-241) cultivated under two different humidity conditions (with and without water stress). a randomized block design with split plots and three replicates was used. in the main plot, the effect of the humidity regimes was studied and in the split plot, the different clones. the dry matter (dm); crude protein (cp) and of neutral detergent fiber (ndf) content; and in vitro dry matter disappearance (ivdmd) were analyzed. the materials submitted to water stress showed a high dehydration level (more than 58% of dm), mainly in elephant grass cultivars. plants submitted to water stress exhibited cp content (17.8%) significantly higher when compared to those plants submitted to the water treatment (14.45%), although, among cultivars, only cameroon (14.68% cp) differed from the others (16.46%pb). as ndf contents, difference among the two humidity regimes was not observed, but mott and cameroon cultivars showed higher contents (61.79%) in relation to those of roxo de botucatu cultivar and hv-241 hybrid (56.60%). difference in ivdmd among humidity regimes was not observed neither among the different clones and the average value was 53.07%.
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.
Caracteriza??o e Sele??o de Clones de Capim-Elefante (Pennisetum purpureum Schum.) na Zona da Mata de Pernambuco
Mello, Alexandre Carneiro Le?o de;Lira, Mário de Andrade;Dubeux Júnior, José Carlos Batista;Santos, Mércia Virgínia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2002, DOI: 10.1590/S1516-35982002000100004
Abstract: this work aimed to characterize an elephantgrass collection (pennisetum purpureum schum.) comprising 71 clones and selecting the best ones to be tested later under grazing conditions. it was carried out at cedro experimental station - ipa, located in vitória de santo ant?o, forest zone of pernambuco state. the period of evaluation included both the raining and the dry season. each clone was represented by a non-replicated plot of 10 m2. according to linear correlation analysis, the more productive clones also showed highest plant height and highest growing point height, greatest stem diameter, highest stem/leaf ratio, highest basal and total tiller numbers and greatest leaf lenght. the same characteristics above were also positively correlated with the leaf blade yield, except stem/leaf ratio. there was a high correlation coefficient (r = 0.9517) between dry matter yield and leaf blade yield. the selection of clones to be tested under grazing conditions was based on the materials that showed the highest leaf blade yield. these materials were: mineir?o/ipeaco, hexaplóide, mole de volta grande, king grass, 591-76 or cameroon, ce 5 ad, gigante de pinda, ce 4 ad, elefante da col?mbia and vrukwona
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