Inferência Bayesiana Na Avaliação Genética De Bovinos Da Raça Tabapuã Do Nordeste Brasileiro

Abstract

RESUMO -Objetivou-se comparar por meio do Fator de Bayes (FB), modelos para estimar componentes de covariância, parâmetros genéticos e valores genéticos para os pesos ajustados aos 205 (P205), 365 (P365) e 550 (P550) dias de idade em animais da raça Tabapuã, criados a pasto no Nordeste do Brasil. Foram utilizadas informações de 26.838 animais no período entre 1975 a 2007 provenientes do controle de desenvolvimento ponderal da Associação Brasileira de Criadores de Zebu (ABCZ). Os componentes de covariância e parâmetros genéticos foram estimados pela abordagem bayesiana em análises uni e bicaracterísticas utilizando-se o programa GIBBS3F90. O modelo completo proporcionou melhor ajuste para a estimativa dos parâmetros genéticos para as características P205 e P365. Quanto à característica P550, o modelo que proporcionou o melhor ajuste foi o que não incluiu o efeito de ambiente permanente. As tendências genéticas de efeito direto foram significativas para as características P205, P365 e P550, correspondendo a incrementos de 2,67 kg, 7,35 kg e 8,32 kg, respectivamente, durante os 32 anos avaliados. As tendências fenotípicas foram significativas apenas para as características P205 e P365, correspondendo a incrementos de 26,82 kg e 22,42 kg, respectivamente. As correlações genéticas entre o peso aos 205, 365 e 550 dias de idade foram de alta magnitude (P205P365=0,90; P205P550=0,90 e P365P550=0,98), podendo-se obter ganhos genéticos via resposta correlacionada para os pesos aos 365 e 550 dias de idade ao selecionar o P205.Palavras-chave: Correlação genética. Ganho genético. Herdabilidade. Tendência genética. Zebu. BAYESIAN INFERENCE IN THE GENETIC EVALUATION OF THE BRAZILIAN NORTHEAST TABAPUÃ CATTLEABSTRACT -The objective was to compare models by Bayes factor (BF) to estimate the (co)variance components, genetic parameters and genetic values for the adjusted weights at 205 (W205), 365 (W365) and 550 (W550) days of age in Tabapuã animals reared on pasture in the Brazilian Northeast. Information about 26,838 cattle born in the period from 1975 to 2007 originally from the weight-development-control system of the Brazilian Association of Zebu Farmers (Associação Brasileira de Criadores de Zebu, ABCZ) was used. The (co) variance components and genetic parameters were estimated by the Bayesian approach, in single-and two-trait analysis, using the GIBBS3F90 software. The full model provided the best fit to estimate the breeding value for W205 and W365 characteristics parameters. For trait W550, the model that provided the best fit was the one that did not include the effect of permanent environment. Genetic trends of direct effect were significant for the W205, W365 and W550 features, corresponding to increments of 2.67 kg, 7.35 kg and 8.32 kg, respectively, during the 32 years evaluated. Phenotypic trends were significant only for W205 and W365 characteristics corresponding to increments of 26.82 kg and 22.42 kg, respectively. The genetic correlations between weight at 205, 365 and 550 days of age were of high magnitude (P205...

Genetic diversity, population structure, and correlations between locally adapted zebu and taurine breeds in Brazil using SNP markers

“…Each individual is represented by a thin vertical line, which is partitioned into colored segments that represent the proportional contribution of the inferred K clusters. The populations are separated by thin vertical black lines similarity of proportion of ancestral contribution pattern of Tabapuã and Indubrasil breeds confirms the common crosses of Nelore and Guzerá cattle during their formation, which can be proven by their low index of genetic differentiation (Brasil et al, 2013;Vercesi Filho et al, 2002 andOliveira et al, 2015). Sindi was the only breed probable presenting homogeneity in the population, as observed by the F IS statistic (0.01235), indicating inbreeding among the animals due to the low Ne.…”

“…Each individual is represented by a thin vertical line, which is partitioned into colored segments that represent the proportional contribution of the inferred K clusters. The populations are separated by thin vertical black lines formed other breeds, such as Indubrasil, which has alleles from Nelore, Guzerá, and Gyr breeds (Vercesi Filho et al, 2002), and Tabapuã, which was formed from Nelore and Guzerá breeds (Oliveira et al, 2015). Studies on zebu breeds in the Americas (Villalobos-Cortés et al, 2015) and Sudan (Hussein et al, 2015) identified similar results for F ST and Nm.…”

Spatial Variability of Noise Generated by a Self-Propelled Coffee Harvester in an Open Area

“…Ordinary kriging proved to be efficient to estimate unsampled values, using a semivariogram fit (Figure 5). Therefore, a spatial distribution map of noise can be built, and the variability can be better visualized (Oliveira et al, 2015). The map showed anisotropic behavior, that is, the sample semivariogram depends only on distance and not on direction; therefore, the semivariogram is the same in all directions.…”

Genetic parameters for growth, reproductive, and carcass traits in Tabapuã cattle

“…Most studies reporting genetic parameters for Tabapuã cattle only consider growth traits (Sakaguti et al, 2003;Campêlo et al, 2004;Ferraz Filho et al, 2004;Pereira et al, 2005;Ribeiro et al, 2007;Sousa Júnior et al, 2010;Caires et al, 2012;Menezes et al, 2013;Bernardes et al, 2015;Oliveira et al, 2015;Campos et al, 2016;Oliveira et al, 2017;Sousa Júnior et al, 2019). Reports are very scarce for reproductive traits (Pereira et al, 2005;Bernardes et al, 2015), and there are no studies for carcass traits in this breed.…”