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| Registros recuperados: 67 | |
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| Silva,Fabyano Fonseca e; Sáfadi,Thelma; Muniz,Joel Augusto; Aquino,Luiz Henrique de; Mourão,Gerson Barreto. |
| O objetivo deste trabalho foi realizar uma análise bayesiana de modelos auto-regressivos de ordem p, AR(p), para dados em painel referentes às diferenças esperadas nas progênies (DEP) de touros da raça Nelore publicados de 2000 a 2006. Neste trabalho, adotou-se o modelo AR(2), indicado pela análise prévia da função de autocorrelação parcial. As comparações entre as prioris, realizadas por meio do Fator de Bayes e do Pseudo-Fator de Bayes, indicaram superioridade da priori independente t-Student multivariada - Gama inversa em relação à priori hierárquica Normal multivariada - Gama inversa e a priori de Jeffreys. Os resultados indicam a importância de se dividir os animais em grupos homogêneos de acordo com a acurácia. Constatou-se também que, em média, a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algoritmos MCMC; Dados em painel; Modelo auto-regressivo. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000100006 |
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| Junqueira,Vinícius Silva; Lopes,Paulo Sávio; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Lourenço,Daniela Andressa Lino; Yokoo,Marcos Jun Iti; Cardoso,Fernando Flores. |
| ABSTRACT We aimed to evaluate the impact of using embryo transfer (ET) information on weaning weight estimated breeding values (EBV) and its accuracy. Data from Hereford and Braford cattle, raised under extensive conditions in Southern Brazil, were used. A model that included ET information in addition to maternal (genetic and permanent environmental) effects as a function of foster dams was compared to a model without ET information. Accuracy of both bulls and calves increased due to inclusion of ET records in 0.04 and 0.12 points, respectively. In general, the inclusion of ET records provided a greater amount of phenotypic variance and most accurate EBV for sires and progeny. The results obtained in this study encourage the use of ET phenotypic records... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Accuracy; Assisted reproduction; Foster dam; Genetic groups. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100405 |
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| Souza,Laaina de Andrade; Carneiro,Paulo Luiz Souza; Malhado,Carlos Henrique Mendes; Silva,Fabyano Fonseca e; Silveira,Fernanda Gomes da. |
| In the present study, alternative and traditional nonlinear models to describe growth curves of Morada Nova sheep reared in the state of Bahia, Brazil, were applied. The nonlinear models were: Schnute, Mitscherlich, Gompertz, Logistic, Meloun I Meloun II, III Meloun, Gamito and Meloun IV. The model adjustment was evaluated by using: Adjusted Coefficient of Determination (R²aj), Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), Mean Squared Error of Prediction (MEP) and Coefficient of Determination of Prediction (R²p). The selection of the best model was based on cluster analysis, using the evaluators as variables. Six out of the nine tested models converged, while Meloun I and Meloun IV were equally effective in explaining animal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cluster analysis; Growth curve; Naturalized breed. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000900007 |
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| Camargo,Ederson Gomes; Marques,Daniele Botelho Diniz; Figueiredo,Elsio Antonio Pereira de; Silva,Fabyano Fonseca e; Lopes,Paulo Sávio. |
| ABSTRACT We aimed to estimate litter size and litter uniformity genetic parameters and genetic trends of Landrace pigs at birth and at three weeks by using multitrait analyses for 2,787 litters. The following litter traits were evaluated: number of piglets born alive (NBA), within-litter weight mean at birth (MBW), within-litter weight standard deviation at birth (SDB), within-litter weight coefficient of variation at birth (CVB), number of piglets at three weeks (NT), within-litter weight mean at three weeks (MT), within-litter weight standard deviation at three weeks (SDT), and within-litter weight coefficient of variation at three weeks (CVT). Heritability estimates for NBA, MBW, SDB, and CVB were 0.09±0.04, 0.31±0.08, 0.01±0.04, and 0.07±0.05,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coefficient of variation; Genetic parameters; Genetic trends; Piglet; Variation. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982020000100402 |
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| Cunha,Daniel de Noronha Figueiredo Vieira da; Pereira,José Carlos; Campos,Oriel Fajardo de; Braga,José Luis; Silva,Fabyano Fonseca e; Martuscello,Janaina Azevedo. |
| The objective of this study was to develop and to evaluate a dynamic simulation model, with stochastic components in order to assess milk production systems. The simulation model was developed by using STELLA 9.0, ZooCalc 1.0 and electronic data sheets. The physical structure of the herd was divided into 15 interlinked modules that represented categories or subdivisions of categories. Mathematical models obtained from the literature were used to simulate the body weight of growing and lactating animals and milk production and milk composition. Electronic data sheets were used to calculate the nutritional requirements and dietary balance. After cost minimization, each feed was evaluated by using ZooCalc 1.0. Some average responses of farm size, zootechnical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Modeling. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400027 |
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| Ribeiro,Louiziane Carvalho; Pérez,Juan Ramón Olalquiaga; Carvalho,Pablo Henrique Andrade; Silva,Fabyano Fonseca e; Muniz,Joel Augusto; Oliveira Júnior,Gregório Murilo de; Souza,Nicholas Vilela de. |
| Objetivou-se avaliar a produção, a composição e o rendimento (na fabricação de queijos) do leite de ovelhas Santa Inês tratadas ou não com ocitocina. Os animais foram mantidos em regime de confinamento e receberam uma dieta com 12% de PB e 65% de NDT. As ovelhas foram distribuídas em dois tratamentos: ordenha manual com injeção endovenosa de três UI de ocitocina e ordenha manual sem injeção de ocitocina (grupo controle). Realizou-se uma ordenha diária, de modo que, até a desmama, as ovelhas permaneceram diariamente com os cordeiros durante 14 horas. Os cordeiros foram desmamados aos 60 dias e as ovelhas continuaram sendo ordenhadas uma vez ao dia até o final da lactação. Foram coletadas amostras de leite para análise dos teores de gordura, de sólidos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gordura; Hormônio; Lactação; Ovino. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000200022 |
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| Carneiro,Paulo Luiz Souza; Malhado,Carlos Henrique Mendes; Martins Filho,Raimundo; Carneiro,Antonio Policarpo Souza; Silva,Fabyano Fonseca e; Torres,Robledo de Almeida. |
| Com o intuito de fornecer subsídios para programas de melhoramento, conservação e expansão da raça Indubrasil do Nordeste brasileiro, avaliaram-se o histórico evolutivo, as estimativas de parâmetros genéticos e a estrutura populacional da raça. Foram utilizadas informações do pedigree de animais nascidos no período de 1964 a 2006 e dados dos pesos ajustados aos 205, 365 e 550 dias de idade de bovinos nascidos a partir de 1976. As estimativas dos coeficientes de herdabilidade foram menores que as encontradas na literatura para os pesos ajustados nas três idades (P205: direta 0,11 ± 0,03 e materna 0,01 ± 0,03; P365: direta 0,16 ± 0,04 e P550: direta 0,15 ± 0,05) e os ganhos genéticos para as características decresceram no período avaliado (P205: -0,028... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endogamia; Ganho genético; Intervalo de geração; Tamanho efetivo; Tendência genética. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001200006 |
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| Cunha,Daniel de Noronha Figueiredo Vieira da; Pereira,José Carlos; Silva,Fabyano Fonseca e; Campos,Oriel Fajardo de; Braga,José Luis; Martuscello,Janaina Azevedo. |
| The objective of this study was to select models of lactation curves with a better adjustment to the observed data in models of milk production simulation systems. A data base on 6,459 recordings of daily milk production was used. These data were obtained from monthly and fortnightly controls of milk between 2004 and 2007, from 472 lactations of animals from ten different milking cow herd farms. Based on rolling averages of milk production (MP-L/day) per cow, the ten herd farms were divided into low (L < 15), medium (15 <M < 20) and high (H > 20). Data were also divided according to the lactation numbers in first, second, third or greater. Eight lactation curve models commonly used in literature were compared. The models were individually... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Modeling; Non-linear model. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400026 |
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| Silva,Hugo Teixeira; Silva,Fabyano Fonseca e; Ferreira,Aloízio Soares; Veroneze,Renata; Lopes,Paulo Sávio. |
| ABSTRACT: We evaluated the inclusion of information on genetic relationship into the analysis of crude protein requirement in diets for pigs of Brazilian Piau breed, using Bayesian inference. The animals were assigned to treatments in a completely randomized design in factorial scheme 4 × 2 (crude protein levels × sex) with 12 repetitions per treatment. The evaluations were carried out in the initial, growing and finishing phases, and after slaughter. The traits evaluated were feed conversion (FC), backfat thickness (BF), daily weight gain (DWG), daily feed intake (DFI) and some carcass cuts. Three models were considered to evaluate the inclusion of information on genetic relationship into the analysis: Model I, a simple linear model; Model II, the same... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bayesian inference; Genetic relationship; Model selection; Performance. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300208 |
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| Sousa,Ithalo Coelho de; Nascimento,Moysés; Silva,Gabi Nunes; Nascimento,Ana Carolina Campana; Cruz,Cosme Damião; Silva,Fabyano Fonseca e; Almeida,Dênia Pires de; Pestana,Kátia Nogueira; Azevedo,Camila Ferreira; Zambolim,Laércio; Caixeta,Eveline Teixeira. |
| ABSTRACT Genomic selection (GS) emphasizes the simultaneous prediction of the genetic effects of thousands of scattered markers over the genome. Several statistical methodologies have been used in GS for the prediction of genetic merit. In general, such methodologies require certain assumptions about the data, such as the normality of the distribution of phenotypic values. To circumvent the non-normality of phenotypic values, the literature suggests the use of Bayesian Generalized Linear Regression (GBLASSO). Another alternative is the models based on machine learning, represented by methodologies such as Artificial Neural Networks (ANN), Decision Trees (DT) and related possible refinements such as Bagging, Random Forest and Boosting. This study aimed to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hemileia vastatrix; Statistical learning; Plant breeding; Artificial intelligence. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401102 |
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| Silva,Fabyano Fonseca e; Sáfadi,Thelma; Muniz,Joel Augusto; Rosa,Guilherme Jordão Magalhães; Aquino,Luiz Henrique de; Mourão,Gerson Barreto; Silva,Carlos Henrique Osório. |
| The animal breeding values forecasting at futures times is a relevant technological innovation in the field of Animal Science, since its enables a previous indication of animals that will be either kept by the producer for breeding purposes or discarded. This study discusses an MCMC Bayesian methodology applied to panel data in a time series context. We consider Bayesian analysis of an autoregressive, AR(p), panel data model of order p, using an exact likelihood function, comparative analysis of prior distributions and predictive distributions of future observations. The methodology was tested by a simulation study using three priors: hierarchical Multivariate Normal-Inverse Gamma (model 1), independent Multivariate Student's t Inverse Gamma (model 2) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: MCMC; Time series forecasting; Prior comparison; Predictive distribution. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200015 |
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| Lima,Leísa Pires; Azevedo,Camila Ferreira; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Viana,José Marcelo Soriano; Oliveira,Eder Jorge de. |
| ABSTRACT: Genome-wide selection (GWS) is currently a technique of great importance in plant breeding, since it improves efficiency of genetic evaluations by increasing genetic gains. The process is based on genomic estimated breeding values (GEBVs) obtained through phenotypic and dense marker genomic information. In this context, GEBVs of N individuals are calculated through appropriate models, which estimate the effect of each marker on phenotypes, allowing the early identification of genetically superior individuals. However, GWS leads to statistical challenges, due to high dimensionality and multicollinearity problems. These challenges require the use of statistical methods to approach the regularization of the estimation process. Therefore, we aimed to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: G-BLUP; BLASSO; Genomic prediction; Genomic heritability. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500368 |
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| Alves,Daniel Pedrosa; Tomaz,Rafael Simões; Laurindo,Bruno Soares; Laurindo,Renata Dias Freitas; Silva,Fabyano Fonseca e; Cruz,Cosme Damião; Nick,Carlos; Silva,Derly José Henriques da. |
| ABSTRACT: Artificial neural networks (ANN) are computational models inspired by the neural systems of living beings capable of learning from examples and using them to solve problems such as non-linear prediction, and pattern recognition, in addition to several other applications. In this study, ANN were used to predict the value of the area under the disease progress curve (AUDPC) for the tomato late blight pathosystem. The AUDPC is widely used by epidemiologic studies of polycyclic diseases, especially those regarding quantitative resistance of genotypes. However, a series of six evaluations over time is necessary to obtain the final area value for this pathosystem. This study aimed to investigate the utilization of ANN to construct an AUDPC in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytophthora infestans; ANN; AUDPC; Artificial intelligence; Plant breeding. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100051 |
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| Silva,Fabyano Fonseca e; Zambrano,Maria Fernanda Betancur; Varona,Luis; Glória,Leonardo Siqueira; Lopes,Paulo Sávio; Silva,Marcos Vinícius Gualberto Barbosa; Arbex,Wagner; Lázaro,Sirlene Fernandes; Resende,Marcos Deon Vilela de; Guimarães,Simone Eliza Facioni. |
| ABSTRACT: Genome association analyses have been successful in identifying quantitative trait loci (QTLs) for pig body weights measured at a single age. However, when considering the whole weight trajectories over time in the context of genome association analyses, it is important to look at the markers that affect growth curve parameters. The easiest way to consider them is via the two-step method, in which the growth curve parameters and marker effects are estimated separately, thereby resulting in a reduction of the statistical power and the precision of estimates. One efficient solution is to adopt nonlinear mixed models (NMM), which enables a joint modeling of the individual growth curves and marker effects. Our aim was to propose a genome association... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: SNP markers; Body weight; Longitudinal data. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100001 |
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| Lima,Leísa Pires; Azevedo,Camila Ferreira; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Suela,Matheus Massariol; Nascimento,Moysés; Viana,José Marcelo Soriano. |
| ABSTRACT: Genome-wide selection (GWS) is based on a large number of markers widely distributed throughout the genome. Genome-wide selection provides for the estimation of the effect of each molecular marker on the phenotype, thereby allowing for the capture of all genes affecting the quantitative traits of interest. The main statistical tools applied to GWS are based on random regression or dimensionality reduction methods. In this study a new non-parametric method, called Delta-p was proposed, which was then compared to the Genomic Best Linear Unbiased Predictor (G-BLUP) method. Furthermore, a new selection index combining the genetic values obtained by the G-BLUP and Delta-p, named Delta-p/G-BLUP methods, was proposed. The efficiency of the proposed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genomic prediction; Selection index; Genetic gain; Asian rice. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400290 |
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| Macedo,Leandro Roberto de; Silva,Fabyano Fonseca e; Cirillo,Marcelo Ângelo; Nascimento,Moysés; Paixão,Débora Martins; Guimarães,Simone Eliza Facioni; Lopes,Paulo Sávio; Santos,Jussara Aparecida dos; Azevedo,Camila Ferreira. |
| Para avaliar a influência do gene halotano sobre a curva de crescimento de suínos, bem como sua interação com o sexo do animal, foi proposta uma modelagem hierárquica Bayesiana. Nesta abordagem, os parâmetros dos modelos não-lineares de crescimento (Logístico, Gompertz e von Bertalanffy) foram estimados conjuntamente com os efeitos de sexo e genótipos do gene halotano. Foram utilizados 344 animais F2(Comercial x Piau) pesados ao nascer, aos 21, 42, 63, 77, 105 e 150 dias. O modelo Logístico foi aquele que apresentou melhor qualidade de ajuste por apresentar menor DIC (Deviance Information Criterion) que os demais. As amostras das distribuições marginais a posteriori para as diferenças entre as estimativas dos parâmetros do modelo Logístico indicaram que o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Melhoramento; Modelos não-lineares; Síndrome do estresse suíno. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001001853 |
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| Registros recuperados: 67 | |
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