Genotype by environment interaction for post-weaning weight gain, scrotal circumference, and muscling score of composite beef cattle in different regions of Brazil

Autor(es)

Santana, Jr., M. L. ^{[1, 2]} ; Eler, J. P. ^[2] ; Cardoso, F. F. ^[3] ; Albuquerque, L. G. ^[4] ; Balieiro, J. C. C. ^[2] ; Pereira, R. J. ^[1] ; Ferraz, J. B. S. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Mato Grosso, Inst Ciencias Agr & Tecnol, Grp Melhoramento Anim Mato Grosso, Rondonopolis, MT - Brazil

^[2] Univ Sao Paulo, Fac Zootecnia & Engn Alimentos, Grp Melhoramento Anim & Biotecnol, Pirassununga, SP - Brazil

^[3] Embrapa Pecuaria Sul, Bage, RS - Brazil

^[4] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Dept Zootecnia, Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Genetics and Molecular Research; v. 13, n. 2, p. 3048-3059, 2014.
• Citações Web of Science: 0

Resumo

The objectives of this study were to characterize and define homogenous production environments of composite beef cattle in Brazil in terms of climatic and geographic variables by using multivariate exploratory techniques; to evaluate the presence of genotype by environment interaction (GxE) for post-weaning weight gain (PWG), yearling scrotal circumference (SC), and yearling muscling (MUS). Hierarchical and nonhierarchical cluster analysis was used to group farms located in regions with similar environmental variables into clusters. Six clusters of farms were formed. The effect of sire-cluster interaction was tested by single-trait analysis. Genetic parameters were estimated by multi-trait analysis considering the same trait to be different in each cluster. The effect of sire-cluster interaction was significant (P <0.01) for PWG and MUS. Estimates of genetic correlations among clusters ranged from 0.31 to 0.93 for PWG, 0.64 to 0.89 for SC, and 0.18 to 0.80 for MUS. These results indicate the need for a genetic analysis on a regional basis or inclusion of the GxE effect in the statistical model to permit appropriate evaluation of the animals. (AU)

• Processo FAPESP: 09/05072-4 - Interação genótipo-ambiente em bovinos de corte compostos e prospecção de composições raciais mais adequadas aos diferentes ambientes de produção
• Beneficiário: Mário Luiz Santana Júnior
• Modalidade de apoio: Bolsas no Brasil - Doutorado