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Search Results: 1 - 10 of 117634 matches for " José Carlos Batista;Mello "
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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.
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
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
Revista Brasileira de Zootecnia , 2002,
Abstract: O estudo visou caracterizar uma cole o de 71 clones de capim-elefante e selecionar os mais promissores para serem testados sob pastejo. A caracteriza o foi realizada na Esta o Experimental do Cedro/IPA, no município de Vitória de Sto. Ant o/PE, nas esta es chuvosa e seca. Cada clone foi representado por parcelas n o repetidas de 10 m2. Segundo análise de correla o linear, os clones mais produtivos em rela o à MS, também apresentaram maiores alturas de planta e de meristemas apicais, diametros de colmo, rela es colmo/folha (C/F), números de perfilhos basais e total e comprimentos de folha. Excetuando-se a rela o C/F, as mesmas características também correlacionaram-se positivamente com a produ o de lamina foliar (LF). Foi observada uma correla o linear positiva e altamente significativa (r = 0,9517) entre as produ es de MS e de LF. Baseando-se nos materiais que apresentaram as maiores produ es de LF/área, foram selecionados 10 clones: Mineir o/IPEACO, Hexaplóide, Mole de Volta Grande, King Grass, 591-76 ou Cameroon, CE 5 A.D., Gigante de Pinda, CE 4 A.D., Elefante da Col mbia e Vrukwona
Características morfológicas e produtivas de leguminosas forrageiras tropicais submetidas a duas frequências de corte
Silva, Valdson José da;Dubeux Junior, José Carlos Batista;Teixeira, Vicente Imbroisi;Santos, Mércia Virgínia Ferreira dos;Lira, Mario de Andrade;Mello, Alexandre Carneiro Le?o de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000100013
Abstract: the objective of this research was to evaluate morphological and productive characteristics of forage legumes under two harvest frequencies (28 and 56 days) and 10 cm harvest intensity. the following legume species were evaluated: arachis pintoi (cv. amarillo), clitoria ternatea, calopogonium mucunoides, desmodium ovalifolium (cv. itabela) and stylosanthes guianensis (cvs. bandeirante, cook, mineir?o). a randomized complete design was used in a factorial arrangement (07 legumes × 02 harvest frequencies), with four replications per treatment and the following variables were analyzed: biomass accumulation, number of branches per plant, number of live leaves/plant, root dry matter, nodule number, and nodule matter. shoot and root dry matter accumulation per unit time was similar for the harvests at every 28 or every 56 days, except for arachis, clitoria, and desmodium, which showed greater shoot and root biomass when harvested every 56 days. nodule number and nodule mass differed among legumes, but a greater nodule number was observed when the legumes were harvested every 56 days. live leaf number per plant was greater at 56 days, except for arachis and calopogonium which showed similar values for both frequencies. harvest frequency affected differently the morphologic and productive characteristics of the studied legumes that indicated the need for different management among the varieties tested.
Repetibilidade e respostas de características morfofisiológicas e produtivas de capim-elefante de porte baixo sob pastejo
Viana, Bruno Leal;Mello, Alexandre Carneiro Le?o de;Lira, Mário de Andrade;Dubeux Júnior, José Carlos Batista;Santos, Mércia Virgínia Ferreira dos;Cunha, Márcio Vieira da;Ferreira, Geane Dias Gon?alves;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009001200024
Abstract: the objective of this study was to estimate the coefficients of repeatability and determination (r2) and the minimum number of measurements necessary to predict the real value of morphophysiological and yield variables, as well as the responses to sheep-grazing of dwarf elephant grass pasture. the experiment was carried out in a randomized block design with five treatments - taiwan a-146 2.27, taiwan a-146 2.37, taiwan a-146 2.114, merker méxico mx 6.31 and mott - and four replicates, over five grazing cycles, between september 2008 and april 2009. mean sward height, leaf area index (lai), light interception (li), mean leaf angles (mla), silage accumulation (sa) and silage accumulation rate (sar) were evaluated. for the variables lai, il and mean sward height of plants, in long cycles, only one measurement was necessary (r2 = 80%) to place them among the most predictable characteristics in the evaluation of elephant grass clones. assessments for sa and sar need longer experimental periods for greater reliability in the estimation of response variables. in dwarf elephant grass, light interception increases with sward height and lai.
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.
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.
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.
Rela??o entre características morfológicas e produtivas de clones de palma-forrageira
Silva, Nalígia Gomes de Miranda e;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;Mello, Alexandre Carneiro Le?o de;Silva, Maria da Concei??o;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001100011
Abstract: this research evaluated the relationship among the morphological and productive characteristics of clones of cactus forage for identification of those that directly contribute to the production. it was evaluated 50 clones of cactus forage planted five years ago and submitted to the first cut two years before the evaluation. characteristics of the plant and of the cladode were evaluated and data were analyzed by descriptive characteristics, pearson correlation and by path analysis of the explanatory independent variables on the dry matter production in t/ha/2 years (main dependent variable). production varied among clones and it was the highest in clones 8, 782 e 418 whose dry matter production was of 40.8; 18.1 and 12.1 tms/ha/2 years, respectively. there was a low correlation among almost all the explanatory variables and the production considered main variable, so, association of characteristics was needed. characteristic height associated with plant width explained better the potential of dry matter production in t/ha/2 years because they presented a high correlation with production (r = 0.71) and the highest direct effect (0.69). indirect and non destructive selection for production have to be based on higher and larger plants.
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