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Bayesian inference in genetic parameter estimation of visual scores in Nellore beef-cattle Genet. Mol. Biol.
Faria,Carina Ubirajara de; Koury Filho,William; Magnabosco,Cláudio Ulhôa; Albuquerque,Lúcia Galvão de; Bezerra,Luiz Antônio Framartino; Lôbo,Raysildo Barbosa.
The aim of this study was to estimate the components of variance and genetic parameters for the visual scores which constitute the Morphological Evaluation System (MES), such as body structure (S), precocity (P) and musculature (M) in Nellore beef-cattle at the weaning and yearling stages, by using threshold Bayesian models. The information used for this was gleaned from visual scores of 5,407 animals evaluated at the weaning and 2,649 at the yearling stages. The genetic parameters for visual score traits were estimated through two-trait analysis, using the threshold animal model, with Bayesian statistics methodology and MTGSAM (Multiple Trait Gibbs Sampler for Animal Models) threshold software. Heritability estimates for S, P and M were 0.68, 0.65 and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Morphological traits; Threshold model; Genetic parameters; Nellore.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400015
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Análise genética de escores de avaliação visual de bovinos com modelos bayesianos de limiar e linear PAB
Faria,Carina Ubirajara de; Magnabosco,Cláudio Ulhôa; Albuquerque,Lúcia Galvão de; Reyes,Arcadio de los; Bezerra,Luiz Antônio Framartino; Lobo,Raysildo Barbosa.
O objetivo deste trabalho foi comparar as estimativas de parâmetros genéticos obtidas em análises bayesianas uni-característica e bi-característica, em modelo animal linear e de limiar, considerando-se as características categóricas morfológicas de bovinos da raça Nelore. Os dados de musculosidade, estrutura física e conformação foram obtidos entre 2000 e 2005, em 3.864 animais de 13 fazendas participantes do Programa Nelore Brasil. Foram realizadas análises bayesianas uni e bi-características, em modelos de limiar e linear. De modo geral, os modelos de limiar e linear foram eficientes na estimação dos parâmetros genéticos para escores visuais em análises bayesianas uni-características. Nas análises bi-características, observou-se que: com utilização de...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amostragem de Gibbs; Características morfológicas; Gado de corte; Valores genéticos.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000700007
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Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle Rev. Ciênc. Agron.
Castro,Letícia Mendes de; Magnabosco,Cláudio Ulhôa; Sainz,Roberto Daniel; Faria,Carina Ubirajara de; Lopes,Fernando Brito.
The aim of the present study was to analyze the interrelationships among the variables and also estimate the genetic correlations between tenderness (WBSF), growth (ILW, FLW and ADG) and carcass (BF, RF and LMA) features. Other purpose was to identify individuals who were more likely to be carriers of favorable genes for tenderness. Growth, carcass and tenderness data from 415 Polled Nellore animals was analyzed. Factor analysis and canonical correlations were used to analyze the phenotypic relationships. The covariance components and genetic parameters were estimated using Gibbs Sampling method. Lack of phenotypical correlations between the WBSF and the other traits were observed. The genetic correlations between WBSF and the other evaluated traits were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carcass; Shear force; Pedigree.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000200022
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Multivariate approach of inter-relationships among growth, consumption and carcass traits in Nellore cattle Rev. Ciênc. Agron.
Magnabosco,Cláudio Ulhôa; Lopes,Fernando Brito; Miyagi,Eliane Sayuri; Lôbo,Raysildo Barbosa; Sainz,Roberto Daniel.
The objective of the present study was to analyze the phenotypic inter-relationships between growth, feed intake and carcass traits in polled Nellore cattle, as well as to determine which bulls produced the most efficient progeny. The experiment was conducted in the feedlot of the Guaporé Pecuária (Livestock) Company, OB Brand. The following traits were analyzed: initial live weight (ILW); final live weight (FLW); average daily gain (ADG); dry matter intake (DMI); gain:feed (G:F); residual feed intake (RFI); rib-eye area (REA); rump fat thickness (RF); backfat thickness at the 12th-13th rib (BF); weighted fat score (WF); and intramuscular fat percentage (IMF). Both univariate and multivariate analyses were performed to analyze the inter-relationships...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cluster; Residual feed intake; Multivariate statistic; Weight gain; Zebu.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100020
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