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Search Results: 1 - 10 of 434401 matches for " Mércia Virginia Ferreira dos;Mello "
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Caracteriza??o da caatinga e da dieta de novilhos fistulados, na época chuvosa, no semiárido de Pernambuco
Santana, Daniel Fernando Ydoyaga;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Ferreira, Marcelo de Andrade;Silva, Maria José de Araújo;Marques, Kleyton Alcantara;Mello, Alexandre Carneiro Le?o de;Santos, Djalma Cordeiro dos;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000100010
Abstract: the experiment was carried out to characterize a manipulated caatinga and to estimate the botanical composition and quality of diet for fistulated steers. the experiment was carried out during the rainy season from march to july, 2003. caatinga was browsed by 24 guzerá and 12 girolando breed heifers and by two esophageal fistulated steers. in caatinga, it was identified 24 families, 38 genus, and 41 species in the two studied strata (out of them, ten species were found in the diets of the animals). forage mass of herbaceous and shrubby-tree components ranged, respectively, from 6,454 and 3,495 kg dm/ha in the beginning of the experiment to 782 and 378 kg dm/ha in the end. in the shrubby-tree and in the herbaceous strata, species grouped as "other species" showed higher absolute frequency. the shrubby-tree stratum is formed mainly by legumes whereas the herbaceous stratum is formed mainly by the "other species" group. grass presence in the diet ranged from 55% in the beginning to 41.8% at the end of the experimental period. "mororó" legume and the buffel grass had high absolute frequencies, showing an expressive presence in the vegetation. leaves of mororó and non-identified grass prevailed in the diet. significant portion of forage crude protein is unavailable because it is linked to acid detergent fiber.
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.
Características estruturais e morfológicas de genótipos de Pennisetum sp. sob pastejo no período de seca
Cunha, Márcio Vieira da;Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Mello, Alexandre Carneiro Le?o de;Ferreira, Rinaldo Luiz Caraciolo;Freitas, Erinaldo Viana de;Nunes, José Carlos;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000300004
Abstract: the experiment was carried out to study structural and morphologic characteristics of five pennisetum sp. genotypes (ce 08 a.d., venezuela, hv-241, elephant b and hexaplóide) under grazing during the dry period in pernambuco forest zone. genotypes were managed under rotational stocking (44 days of resting and four days of grazing period). the experimental design was randomized blocks in a split plot arrangement, and four replications. the genotypes represented the plots, and grazing cycles, the subplots. there was variation in the structural and morphologic characteristics of the pennisetum sp. genotypes. the ce 08 a.d. and elephant b presented high density of green leaf blade, low percentage of dead material and high density of remaining basal tillers and new aerial tillers, with averages of 5.0±0.4 kg dm/ha/cm; 33±0.2%; 22±0.2 and 146±0.4 tillers/m2, respectively. the hv-241 presented high participation of dead material in its aerial biomass (55.6±0.3%) due to high tiller mortality (19±0.3 and 114±0.4 basal and aerial dead tillers/m2, respectively). the genotypes ce 08 a.d. and elephant b had been distinguished as promising to be used under grazing in the dry period. the genotype hv-241, elephantgrass hybrid with pearl millet, was more affected by water stress during the dry period of the year.
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.
Comportamento de linhagens de sorgo forrageiro submetidas a déficit hídrico sob condi??o controlada
Amaral, Sérgio Ribeiro do;Lira, Mário de Andrade;Tabosa, José Nildo;Santos, Mércia Virginia Ferreira dos;Mello, Alexandre Carneiro Le?o de;Santos, Venésio Felipe dos;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000800010
Abstract: the objective of this work was to evaluate the effects of water deficit stress on establishment, development and survival rate of 11 forage sorghum lines in a greenhouse. the experiment was carried out under a randomized block design, with split-splot arrangement and five replications. each replication was formed by a container of 250 l capacity, filled with 187.9 kg of sandy soil. two stress periods were studied, with three irrigations, at the begining of tests and when the plants showed large numbers of dry leaves. during the first period all lines had high survival rates showing resistance to water deficit stress. slower growing lines suffered less with the imposed water deficit. during the second water deficit stress period there were no significant differences between the lines in plant development. along both stress periods, growth rate did not distinguish satisfactorily lines with distinct behavior, as relate to drought resistance, when those lines were competing on the same recipient and high population density. lines 84, 29, 99, 41, 63, and 104 had higher stress resistant while lines 33, 38, 40, 67, and 92 had lower stress resistant.
Ensaios preliminares sobre autofecunda??o e cruzamentos no melhoramento do capim-elefante
Silva, Maria da Concei??o;Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Mello, Alexandre Carneiro Le?o de;Freitas, Erinaldo Viana de;Santos, Ramilton Jader Menezes;Ferreira, Rinaldo Luiz Caraciolo;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000300004
Abstract: the objectives of this work were to evaluate the self-pollination as a tool in the elephantgrass (pennisetum purpureum) breeding and to compare progenies of pennisetum purpureum origined from different breeding strategies: self-pollination, intraspecific crossbreeds, and interspecific crossbreeds with pennisetum glaucum. the experimental treatments were represented by the three fecundation forms: intraspecific crossbreed, interspecific crossbreed and self-pollination. a total of ten families originated from intraspecific crossbreed resulting in 160 progenies; two families originated from interspecific crossbreed resulting in 38 progenies, and two families originated from self-pollination resulting in 40 progenies, was evaluated. the evaluated traits were dry matter production (kg/tussock), dry matter concentration (%), plant height (m), number of basal tillers (n./tussock) and survival index (%), in two evaluations and non-replicated plots. the intraspecific crossbreed, interspecific crossbreed and self-pollination presented average dry matter production of 0.47, 0.78, and 0.46 kg of dm/tussock, at first evaluation and 0.14, 0.23, and 0.22 kg of dm/ tussock, at second evaluation, respectively. this indicates the necessity of plot replication to separate the environmental effect from the genetic effect. the interspecific crossbreed showed potential to generate progenies with satisfactory dry matter concentration which is more appropriated for ensiling. the treatments showed potential to release variability of traits evaluated through vegetative propagation, however, the low survival index of self-pollinated progenies reduces the probability of obtaining pure lines of elephantgrass.
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.
Genótipos de capim-elefante sob pastejo no período de seca na Zona da Mata de Pernambuco: fatores relacionados à eficiência de pastejo
Cunha, Márcio Vieira da;Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Mello, Alexandre Carneiro Le?o de;Freitas, Erinaldo Viana de;Apolinário, Valéria Xavier de Oliveira;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000200004
Abstract: the experiment was carried out to evaluate factors related to the grazing efficiency of five pennisetum sp. genotypes (ce 08 a.d., venezuela, hv-241, elephant b and hexaplóide) during the dry period in the forest zone of pernambuco. genotypes were managed under rotational stocking (44 days of resting and four days of grazing period). it was used a split-plot arrangement in a complete randomized block design (genotypes represented the plots; grazing cycles, the subplots). six replications were used to determine pre-grazing total leaf blade mass and green and senescent leaf blade mass. four replications were used for leaf blade accumulation and grazing efficiency and, for these variables, it was used a complete randomized blocks design. the ce 08 a.d. and elephant b presented greater pre-graze total leaf blade mass, green leaf blade, green leaf blade accumulation, and grazing efficiency, with averages of 1,374 kg dm/ha, 737 kg dm/ha, 654 kg dm/ha/44 days and 80% of the green leaf blade accumulation, respectively. the highest grazing efficiency (100% of the green leaf blade accumulation) occurred at the hv-241 pastures. this high grazing efficiency was associated to the low green leaf blade accumulation (155 kg of ms/ha/44 days). the lowest grazing efficiency was observed for the hexaplóide (59% of the green leaf blade accumulation), possibly due to high losses under grazing (30% of the pre-grazing total leaf blade mass). the green leaf blade mass decreased mostly until the second grazing day, while the losses of total leaf blade were higher in the second and third grazing days. the genotypes ce 08 a.d. and elephant b presented potential to be used under rotational stocking, in the pernambuco forest zone.
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.
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