oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 5 )

2019 ( 377 )

2018 ( 589 )

2017 ( 624 )

Custom range...

Search Results: 1 - 10 of 387619 matches for " Rêgo Fabíola Cristine de Almeida "
All listed articles are free for downloading (OA Articles)
Page 1 /387619
Display every page Item
Características morfológicas e índice de área foliar do capim-tanzania (Panicum maximum Jacq. cv. Tanzania-1) manejado em diferentes alturas, sob pastejo
Rêgo Fabíola Cristine de Almeida,Cecato Ulysses,Canto Marcos Weber do,Martins Elias Nunes
Revista Brasileira de Zootecnia , 2002,
Abstract: O objetivo do trabalho foi avaliar o efeito de diferentes alturas (24, 26, 43, 45, 52, 62, 73 e 78 cm) do pasto e diferentes períodos de coleta (28, 56, 84 dias), sobre a densidade de perfilhos aéreos e basais, peso e diametro de perfilhos basais, índice de área foliar (IAF), altura do meristema apical, número de nós e comprimento de entrenós em pastagem de capim-Tanzania (Panicum maximum Jacq. cv. Tanzania - 1). Foram utilizados novilhos da ra a Nelore em regime de pastejo com carga animal variável, por meio da técnica "put and take". O delineamento experimental utilizado foi inteiramente casualizado com duas repeti es. A densidade de perfilhos aéreos, o peso, o diametro, o número de nós e o comprimento de entrenós de perfilhos basais , a altura de meristema apical e o IAF aumentaram com os incrementos da altura de manejo das plantas. O perfilhamento basal n o foi alterado em fun o das alturas de manejo, mas reduziu no decorrer do experimento, assim como o perfilhamento aéreo. As variáveis número de nós, comprimento de entrenós, altura do meristema apical e IAF apresentaram comportamento quadrático, em fun o do período de coleta.
Uso de N-alcanos na estimativa da composi??o botanica em amostras com diferentes propor??es de Brachiaria brizantha e Arachis pintoi
C?rtes, Cristiano;Damasceno, Julio César;Paine, Rafael Cesário;Fukumoto, Nelson Massaru;Rêgo, Fabíola Cristine de Almeida;Cecato, Ulysses;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000500006
Abstract: this trial was carried out to determine the composition of n-alkanes (c24 to c36) in hypothetical diets comprising of pure brachiaria brizantha stapf. cv. marandu and arachis pintoi koprov & gregory. cv. amarillo and mixtures of these two spececies with 15%, 30%, 45%, or 60% of arachis pintoi); it also intended to identify the combination of alkanes that allows to calculate the botanical composition of diets with the smallest residual value (real less estimated values). the forages were sampled in the summer. the n-alkanes were extracted for the direct saponification method and identified and quantified by the gas chromatography analysis. alkane c34 was used as internal marker. the proportions of a. pintoi in the diets were estimated by the minimization of z (sum of the squares of the deviations) between the real proportion of the analyzed alkanes and the pre-established proportions (treatments), using duncan et al. (1999) equation. the prevalence of odd carbonic chains was detected. the total concentration of n-alkanes decreased as the proportion of a. pintoi increased in the mixtures. good estimates of the botanical composition of the mixtures of a. pintoi with b. brizantha were obtained from the alkanes c29, c31, c33 and c35. the alkane c35 was fundamental for the quality of the estimates. the results indicate the great potential of the technique for studies of grazing animal diet.
Características morfológicas e índice de área foliar do capim-tanzania (Panicum maximum Jacq. cv. Tanzania-1) manejado em diferentes alturas, sob pastejo
Rêgo, Fabíola Cristine de Almeida;Cecato, Ulysses;Canto, Marcos Weber do;Martins, Elias Nunes;Santos, Geraldo Tadeu dos;Cano, Clovenilson Perissato;Peternelli, Maurício;
Revista Brasileira de Zootecnia , 2002, DOI: 10.1590/S1516-35982002000800008
Abstract: the effect of different sward heights (24, 26, 43, 45, 52, 62, 73 and 78 cm) and different sampling periods (28, 56, 84 days), on basal and aerial tiller density, weight and diameter of basal tillers, leaf area index (lai), meristem apical height, node number and internode length basal tiller in tanzaniagrass (panicum maximum jacq. cv. tanzania - 1) is provided. nelore steers were used in grazing, with variable stocking rates, using put and take techniques. the experimental design was completely randomized, with two replications. aerial tiller density, weight, diameter, node number and internode length basal tiller, apical meristem height and leaf area index increased according to the higher sward management height. basal tillering was not affected by sward management heights, but decreased during the experiment. aerial tiller had a similar behavior. node number, internode length, apical meristem height and lai had a negative quadratic behavior, according to the sample collection period.
Fermentation profile, chemical composition and dry matter losses of orange pulp silage with different microbial inoculants Perfil fermentativo, composi o bromatológica e perdas em silagem de baga o de laranja com diferentes inoculantes microbianos
Fabíola Cristine de Almeida Rego,Agostinho Ludovico,Luiz Cesar da Silva,Lisiane Dornelles de Lima
Semina : Ciências Agrárias , 2012,
Abstract: The objective of this experiment was to evaluate the effects of microbial inoculants on the reduced concentration of gases and effluent, dry matter recovery, pH, volatile fatty acids, and chemical composition of orange pulp silage, using a completely randomized design, with four treatments and four replicates per treatment. The treatments were: orange pulp silage (CONT), citrus pulp silage + Lactobacillus plantarum (LAC), citrus pulp silage + Lactobacillus buchneri (BUCH), citrus pulp silage + Lactobacillus plantarum and buchneri (LACBUCH). Inoculants were applied at a rate of 25 liters of solution per ton of citrus pulp containing 1x103 CFU respectively of Lactobacillus plantarum and Lactobacillus buchneri per gram of silage. There was no effect of the usage of different inoculants on the reduction of gas and effluent, as well as the pH of the silage. The dry matter (DM), crude protein (CP), non-fibrous carbohydrate (NFC), mineral matter (MM), ether extract (EE) and the profile of fatty acids did not change significantly with the inclusion of the inoculants. The contents of neutral detergent fiber (NDF) and acid detergent fiber (ADF) were higher for silage with Lactobacillus buchneri compared to control. The administration of microbial inoculants in orange pulp silage did not result in benefits relative to the dry matter losses during ensiling or the nutritional components. Objetivou-se com este experimento avaliar os efeitos de inoculantes microbianos sobre as perdas por gases e efluentes, recupera o de matéria seca, pH, ácidos graxos voláteis e composi o bromatológica de silagens de polpa cítrica, usando-se um delineamento inteiramente casualizado, com quatro tratamentos e quatro repeti es. Os tratamentos foram: silagem de polpa cítrica (CONT), silagem de polpa cítrica + Lactobacillus plantarum (LAC), silagem de polpa cítrica + Lactobacillus buchneri (BUCH); silagem de polpa cítrica + Lactobacillus plantarum e buchneri (LACBUCH). Os inoculantes foram aplicados na raz o de 25 litros de solu o por tonelada de forragem, contendo 1x103 UFC de Lactobacillus plantarum e 1x103 UFC de Lactobacillus buchneri por grama de silagem. N o houve efeito do uso de diferentes inoculantes sobre as perdas por gases e efluentes, assim como no pH. Os teores de matéria seca, proteína bruta, carboidratos n o fibrosos, matéria mineral, extrato etéreo e o perfil de ácidos graxos n o sofreram altera es significativas com a inclus o dos inoculantes. Os teores de fibra em detergente neutro e fibra em detergente ácido foram superiores para a silagem com Lactobacillus buchner
Molecular Study of the Genetic Variability of Pumpkins Landraces from Brazilian Amazon  [PDF]
Lúcia Helena Pinheiro Martins, Maria Teresa Gomes Lopes, Hiroshi Noda, Pedro de Queiroz Costa Neto, Ayrton Luiz Urizzi Martins, Fabíola Viana de Almeida, Liane Cristine Rebou?as Demosthenes
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.94035
Abstract: The Cucurbita maxima Duchesne is a vegetable crop plant cultivated and maintained by traditional Amazon communities, Brazil. The situation is worsened by the possibility of disappearance of local populations and genetic variability of this specie, taking into account the today changes promoted in family farming. The aim of this study was to estimate the current levels of genetic variability of local cultivars through the use of molecular markers (Amplified Fragment Length Polymorphism—AFLP). We chose to collect in two distinct micro regions in order to identify possible influences of geographic isolation and different levels of market requirements in the conservation of the genetic variability of the C. maxima. For the molecular analysis, bulk samples of fresh leaves of 15 plants/half-sibling family were collected in paper bags. There were 34 samples from the half-sib families. The analysis of the results half-sib obtained by methods of estimation of genetic variation by molecular markers shows that the forms of cultivation and management adopted by family farmers maintain the identities of the local/landraces (native cultivars) and, at the same time, the levels of diversity for the assurance of adaptability macro-environmental.
Hemoglobin polymorphism in Hampshire Down sheep herd/ Polimorfismo de hemoglobina em rebanho de ovinos Hampshire Down
Fabíola Cristine de Almeida Rego,Flavio Antonio Barca Junior,Luiz Fernando Coelho Cunha Filho,Werner Okano
Semina : Ciências Agrárias , 2011,
Abstract: The present study aimed to determine the types of hemoglobin in Hampshire Down crossbreed sheep, and verify that this locus is in Hardy-Weinberg equilibrium. There have been collected 46 blood samples of healthy Hampshire Down crossbreed sheep. These samples were used to separate the hemoglobin per electrophoresis. The electrophoresis of the hemoglobin revealed a slow band characterized as hemoglobin A (HbAA), a fast band characterized as hemoglobin B (HbBB) and two bands in the heterozygous hemoglobin A and B (HbAB). The HbAB type was the most frequently one, followed by hemoglobin A (HbAA) and B (HbBB). The genotypic frequency of individuals BB, AB and AA were 36,95; 54,35 and 8,70% respectively. The allelic frequency of A and B were respectively 35,87% and 64,13%.. The qui square test (?2 = 0.859 and p = 0.6509) confirmed that the tested locus is in Hardy-Weinberg equilibrium. O presente trabalho teve como objetivo determinar os tipos de hemoglobinas em ovinos Hampshire Down e verificar se este locus encontra-se em equilíbrio de Hardy-Weinberg. Foram coletadas 46 amostras de sangue de ovinos Hampshire Down, considerados clinicamente sadios. Estas amostras foram utilizadas para a separa o das hemoglobinas por eletroforese. A eletroforese das hemoglobinas revelou uma banda lenta caracterizada como hemoglobina B (HbBB), uma banda rápida caracterizada como hemoglobina A (HbAA) e duas bandas no heterozigoto para hemoglobinas A e B (HbAB). A variante HbAB foi a mais freqüentemente encontrada, seguida pela hemoglobina A (HbAA) e B (HbBB). A freqüência genotípica dos indivíduos BB, AB e AA foram 36,95; 54,35 e 8,70% respectivamente. A freqüência alélica de A e B foram respectivamente 35,87% e 64,13%. Pelo teste do qui-quadrado realizado (?2 = 0,859 e p=0,6509) confirmou-se que o locus testado está em equilíbrio de Hardy-Weinberg.
Sistemas para crescimento e termina??o de bovinos de corte a pasto: avalia??o do desempenho animal e características da forragem
Prado, Ivanor Nunes do;Moreira, Fernanda Barros;Cecato, Ulysses;Wada, Fábio Yoshimi;Oliveira, Elir de;Rego, Fabíola Cristine de Almeida;
Revista Brasileira de Zootecnia , 2003, DOI: 10.1590/S1516-35982003000400023
Abstract: the aim of this work was to evaluate the weight gain of growing and finishing steers, the life weight gain per hectare, and the forage quality in different grass production systems in the winter and summer. in the winter, the black oat pasture (bop) and star grass (sga) production systems were evaluated. in the summer, the millet (mil), momba?a (mom), and star grass (sga) production systems were evaluated and the effect of the production systems used in the winter on the animal performance in the summer was evaluated too. in the winter, the bop system resulted in higher final body weigh (fw 381 kg) higher average daily gain (adg 0,64 kg/day) and higher life weight gain/ha (lwg/ha 233 kg) when compared with sga system (fw 332 kg, adg -0,01 kg/day and lwg/ha -1,38 kg). the animals kept on bop system in the winter had lower performance in the summer. for the growing animals, the bop in the winter and mil in the summer resulted in higher final body weigh (447 kg) when compared with bop in the winter and mom in the summer (414 kg) and sga in the winter and mom in the summer (397 kg). for the finishing steers, there was no difference between the systems evaluated. in the winter, the bop and sga presented means levels of 15 and 5% of crude protein (cp), 51 and 81% of neutral detergent fiber (ndf), 31 and 51% of acid detergent fiber (adf), and 81 and 45% of in vitro dry matter digestibility (ivdmd). in the summer, the sga, mom and mil presented means levels of 9, 9, and 18% of cp, 65, 64, and 54% of ndf, 40, 39, and 32% of adf, and 55, 60, and 80% of ivdmd.
Influência de variáveis químicas e estruturais do dossel sobre a taxa de ingest?o instantanea em bovinos manejados em pastagens tropicais
Rego, Fabíola Cristine de Almeida;Damasceno, Júlio César;Martins, Elias Nunes;Cortes, Cristiano;Fukumoto, Nelson Massaru;Roeshi, Lauri;Santos, Geraldo Tadeu dos;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000300009
Abstract: steer forage intake rate (ir) was evaluated in pastures of brachiaria brizantha, panicum maximum cv. tanzania, arachis pintoi and a mixed of brachiaria brizantha with arachis pintoi. the objectives were to define sward structural characteristics and chemical composition nutrients of each pasture most determinant of forage intake rate by grazing steers. the steers grazed in pairs, passing through all grass species maintained at different sward heights in successive days. after three hours fast the animals were allowed to graze each experimental area for 60 minutes and had their grazing time and bite numbers registered. forage intake was estimated by the double sampling technique. sward structural characteristics used in the model for estimation of ir were: average sward height, morphological component proportion (%), morphological component mass (ton dm/ha) and density of morphological components (kg dm/ha/cm). the chemical composition was expressed as crude protein (cp) and neutral detergent fiber (ndf). sward variables were selected using the stepwise statistical procedure. the ir equations defined from the studied characteristics were: marandu grass: ir = 59,8980 + 0,7299 gl + 3,5777 dma - 1,2459 ndfl + 0,2882 sh (gl - proportion of green leaves, fm - forage mass, ndfl - ndf of leaves, sh - average sward height). tanzania grass: ir = 111,762 -4,1532 cpl + 0,3469 gl - 0,5207 ndfl (cp of leaves, gl - proportion of green leaves, ndfl - ndf of leaves). peanut forage: ir = -196,589 + 12,1978 cps + 8,3406 dma + 1,1060 gs +17,3669 gla (cps - stem cp, dma - dry matter availability, gla - green leaves availability). mixed pasture: ir= -7,25 + 1,15ha -0,22hi + 18,49aa -9,88gla + 0,49hm + 1,00cpl (ha - peanut forage height, hi - weed species height, aa - arachis availability, gla - green leaf availability of marandu grass, hb - marandugrass sward height, cpl - cp of leaves of marandugrass).
Uso de n-alcanos na estimativa da composi??o botanica da dieta em ovinos alimentados com diferentes propor??es de Brachiaria decumbens Stapf e Arachis pintoi Koprov e Gregory
Fukumoto, Nelson Massaru;Damasceno, Julio Cesar;C?rtes, Cristiano;Roehsig, Lauri;Rego, Fabíola Cristine de Almeida;Cecato, Ulysses;Branco, Antonio Ferriani;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000500023
Abstract: the objective of this experiment was to use n-alkane to estimate accurately and precisely the botanical composition of dietary forage in sheep fed different proportions of arachis pintoi koprov & gregory cv. amarillo and brachiaria decumbens stapf (0, 15, 30, 45 e 60% of arachis pintoi). twenty lambs were used in a completely randomized design with 10 days for diet adaptation and 5 days for fecal collection. both fecal composites and hay samples were analyzed for n-alkane concentration. dietary forage proportions were estimated from measured concentrations of n-alkanes in feces and forage by the least square sum of deviations. multivariate analyses and canonical variables were used to select the most discriminatory alkane with the obtained data submitted to analysis of variance. means were compared using the "t" test and the adjustments of the estimated values in relation to the observed were done by linear regression. the canonical variables indicated that the alkanes c35, c33, c30, c31, c27, c29 and c36 had the greatest discriminatory potential. therefore, the use of all these alkanes in the calculation was more accurate and precise (p <0.05) than the use of a combination of 2 or 3 alkanes to estimate the proportion of a. pintoi in the diet. the best adjustment of the regression was also found for these alkanes. the "t" test for the intercept of the equation (a) and the regression coefficient (b) showed that a = 0 and b = 1, indicating that the estimated values are equivalent to the observed. the multivariate analysis appears to be an important tool to select n-alkanes for diet evaluation.
Comportamento ingestivo de novilhos mesti?os em pastagens tropicais manejadas em diferentes alturas
Rego, Fabíola Cristine de Almeida;Damasceno, Júlio César;Fukumoto, Nelson Massaru;C?rtes, Cristiano;Hoeshi, Lauri;Martins, Elias Nunes;Cecato, Ulysses;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000600006
Abstract: the chewing behavior of crossbred beef steers grazing pure swards of marandugrass (brachiaria brizantha stapf hoesch cv. marandu), tanzaniagrass (panicum maximum jacq. cv. tanzania), and forage peanut (arachis pintoi cv. amarillo) as well as a mixed sward of marandugrass plus forage peanut all managed to yield different heights was evaluated in this trial. paddocks of grasses were managed through grazing to obtain six different heights while those of forage peanut and mixed pasture were lowered by using the intermittent grazing simulation technique. the amount of ingested forage was estimated using the double weighting method. the ingestion rate (ir, g dm/min) was determined according to pasture height (ph) and green leaf mass (glm), both of which called as the z variable in the model: ir= irmax (1 - (1 - e(-k x z)), where irmax is the parameter that represents the maximum potential ingestion rate (g dm/min) and k is the parameter that represents the variation in ir per each unit of variation in z. the ir changed in response to ph for all forages; however, the ir varied in response to glm only for forage peanut and marandugrass. the ir, as function of ph, averaged 66.49 g dm/min across forages and was more sensitive to variation in ph for forage peanut than for the remaining species (k = 0.09 vs. k = 0.039). the time spent chewing each g dm per bite was greatest for the tanzaniagrass and the mixed sward averaging 3.16 and 2.83 seconds, respectively. manipulation of marandugrass and forage peanut required 0.8 and 0.68 second, respectively. in order to keep high ir, animals on forage peanut increased the bite rate while those grazing the other forage species enhanced the amount of ingested feed per bite.
Page 1 /387619
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.