Please use this identifier to cite or link to this item: http://repositorio.ufpa.br:8080/jspui/handle/2011/4790
Title: Parâmetros genéticos, tendências e resposta à seleção de características produtivas da raça Nelore na Amazônia Legal
metadata.dc.creator: SENA, Josynélia do Socorro da Silva
metadata.dc.contributor.advisor1: MARCONDES, Cíntia Righetti
Keywords: Pecuária
Bovino
Melhoramento genético
Raça Nelore
Herdabilidade
Amazônia brasileira
Issue Date: 22-Jul-2011
Publisher: Universidade Federal do Pará
Empresa Brasileira de Pesquisa Agropecuária
Universidade Federal Rural da Amazônia
Citation: SENA, Josynélia do Socorro da Silva. Parâmetros genéticos, tendências e resposta à seleção de características produtivas da raça Nelore na Amazônia Legal. 2011. 67 f. Dissertação (Mestrado) - Universidade Federal do Pará, Núcleo de Ciências Agrárias e Desenvolvimento Rural, Empresa Brasileira de Pesquisa Agropecuária, Universidade Federal Rural da Amazônia, Belém, 2011. Programa de Pós-Graduação em Ciência Animal.
Abstract: The objectives of this study were to estimate genetic parameters (heritabilities and correlations), non-genetic effects, genetic tendency and response to selection for growth (standardized weights at 120, 210 and 450 days) and reproductive traits (age at first calving and scrotal perimeter to 450 days) of Nelore males and females raised in Amazon region. Database consisted of 211,744 records of Nelore cattle, participants in the Genetic Improvement Program of Nelore (PMGRN Nelore-Brazil). The consistency of the data, descriptive analysis of variance and model selection for each trait were performed using Statistical Analysis System. The estimated mean and standard deviation were 122.9 19.0, 179.6 28.1, 262.4 45.5, 227.2 29.2, 37.1 4.7, respectively for P120, P210, P450, PE450 and IPP. The heritabilities for P120 were 0.24, 0.21 and 0.36 for h²d, h²m and h²t , respectively, for P210 were 0.29, 0.16 and 0.45 h²d, h²m e h²t , respectively and P450, PE450 and IPP, were 0.48, 0.49 and 0.22, respectively. The genetic correlations between weights ranged from 0.51 to 0.78, among PE450, and weights ranged from 0.26 to 0.46, among IPP and weights were low and negative, and between IPP and PE450 was null. In all traits, the genetic gains were higher than phenotypic, except for IPP. The results of response to selection ranged from 0.27 to 0.11 kg / year, from 0.49 to 0.20 kg / year, from 1.32 to 0.53 kg / year, from 0.08 to 0.03 cm / year and 0.06 to 0.02 days / year for P120, P210, P450, PE450 and IPP, respectively. Therefore, all traits can be used as selection criteria, in order to improve productivity.
URI: http://repositorio.ufpa.br/jspui/handle/2011/4790
Appears in Collections:Dissertações em Ciência Animal (Mestrado) - PPGCAN/Castanhal

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