9 documents found, page 1 of 1
Genotype-environment interaction effects on weight gain in cattle using reactio...
Zubler, Rafaela; Araújo, Cláudio Vieira de; Menezes, Flávio Luiz de; Mota, Rodrigo Reis; Araújo, Simone Inoe; Lôbo, Raysildo BarbosaThe existence of genotype-environment interaction (GEI) using reaction norm models and their impact on the genetic evaluation of Nellore sires for body weight at 120, 210, 365 and 450 days of age was verified. Three models were used: animal model (AM) that disregards GEI and the one-step reaction norm model with homogeneous and heterogeneous residual variance (1SRNMH_het). Bayes Inference via Gibbs Sampling was...
Contemporary groups in the genetic evaluation of Nellore cattle using Bayesian ...
Silva, Delvan Alves da; Silva, Fabyano Fonseca e; Ventura, Henrique Torres; Junqueira, Vinícius Silva; Silva, Alessandra Alves da; Mota, Rodrigo ReisO objetivo deste trabalho foi avaliar os critérios para formação de grupos de contemporâneos (GCs) na avaliação genética de peso ao desmame em bovinos Nelore. Foram utilizados 713.474 registros de 3.066 rebanhos localizados no Centro-Oeste e no Norte do Brasil. Os dados foram provenientes do Serviço de Registro Genealógico das Raças Zebuínas da Associação Brasileira dos Criadores de Zebu. As estruturas de dados...
Multi-Trait analysis of growth traits: fitting reduced rank models using princi...
Mota, Rodrigo Reis; Costa, Edson Vinícius; Lopes, Paulo Sávio; Nascimento, Moyses; Silva, Luciano Pinheiro da; Silva, Fabyano Fonseca eObjetivou-se estudar a efetividade da redução da dimensão da matriz de covariância do efeito genético direto na avaliação genética do crescimento (pesos dos 100 aos 730 dias de idade) de bovinos Simental, por meio da análise de componentes principais, e estimar componentes de (co)variância e parâmetros genéticos. A análise de componentes principais foi realizada ajsutando-se cinco diferentes modelos: um modelo ...
Canonical-correlation analysis applied to selection-index methodology in quails
Mota, Rodrigo Reis; Hidalgo, André Marubayashi; Silva, Luciano Pinheiro da; Martins, Elias NunesGenetic evaluations in dual-purpose quails (Coturnix coturnix) have demonstrated that overall genetic gains in a breeding program are achieved not only based on a specific trait, but on several. The most common technique to use all this information is the selection index. Another alternative may be the canonical-correlation analysis applied to selection index. There is, however, a lack of studies using canonica...
Benchmarking Bayesian genome enabled-prediction models for age at first calving...
Mota, Rodrigo Reis; Silva, Fabyano Fonseca e; Guimarães, Simone Eliza Facioni; Hayes, Ben; Fortes, Marina Rufino Salinas; Kelly, Matthew JohnCow fertility traits are key factors that influence beef production profitability, and is particularly important in tropical environments where achieving high reproductive rates is challenging. Genomic selection (GS) has the potential to improve genetic gain rates for reproduction, if genomic estimated breeding values (GEBV) for these traits are sufficiently accurate. Several Bayesian models have already been p...
Bayesian estimation of genetic parameters for individual feed conversion and bo...
Caetano, Giovani da Costa; Mota, Rodrigo Reis; Silva, Delvan Alves da; Oliveira, Hinayah Rojas de; Viana, José Marcelo SorianoWe estimated genetic correlations between partial and total body weight gain (BWG) and individual feed conversion (FC) aiming to identify possible partial traits as selection criteria in meat quail breeding programs. Data included 379 records from two different genetic lines (188 quails from UFV1 and 191 from UFV2). The following traits were evaluated: individual feed conversion from 21 to 28 (FC21–28) and from...
The influence of animals from embryo transfer on the genetic evaluation of grow...
Mota, Rodrigo Reis; Lopes, Paulo Sávio; Marques, Luiz Fernando Aarão; Silva, Luciano Pinheiro da; Resende, Marcos Deon Vilela deThe weight records from Simmental beef cattle were used in a genetic evaluation of growth with or without the inclusion of animals obtained by embryo transfer. A multi-trait model in which embryo transfer individuals were excluded (MTM1) contained 29,510 records from 10,659 animals, while another model without exclusion of these animals (MTM2) contained 62,895 weight records from 23,160 animals. The weight reco...
Genomic reaction norms for tick resistance in Hereford and Braford beef cattle
Mota, Rodrigo ReisCoordenação de Aperfeiçoamento de Pessoal de Nível Superior; O “carrapato do boi” é um parasito que causa danos substanciais na produção de bovinos em áreas tropicais. Embora países como o Brasil tenham progredido em avaliações genéticas para a resistência ao carrapato, essas avaliações normalmente não tem considerado a interação genótipo x ambiente (G*A), o que pode afetar diretamente no ganho genético uma vez...
Avaliação genética do crescimento de bovinos da raça Simental utilizando modelo...
Mota, Rodrigo ReisConselho Nacional de Desenvolvimento Científico e Tecnológico; Weight records from 10,659 Simmental beef cattle provided by the Associação Brasileira dos Criadores das Raças Simental e Simbrasil (Brazilian Association of Farmers of the Simmental and Simbrasil Breeds) (ABCRSS) were used to estimate the (co)variance components and genetic parameters for weights in the growth trajectory using multi-trait models (M...