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Effects of sex and age on genotype by environment interaction for beef cattle weight studied using reaction norm models.
MedLine Citation:
PMID:  21724939     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The interest in the effect of genotype by environment interaction (GEI) is increasing because animal breeding programs have become geographically broader. Climate changes in the next decades are also expected to challenge the present breeding goals, increasing the importance of environmental sensitivity. The aim of this work was to analyze GEI effect on cattle weight using the environmental sensitivity predicted by random regression reaction norm models, including sex and age effects as additional dimensions in the study. Genetic parameters were estimated for adjusted weights of Brazilian Nelore cattle at different ages (120, 210, 365 and 450 days), using linear polynomials for random regression analysis. The analyses with sex as a fixed effect (total analyses - TA) were compared to those with sex-separated progenies (male and female progeny analyses - MPA and FPA, respectively). (Co)variance components were estimated and breeding values calculated as expected progeny differences (EPDs). The results showed important differences in reaction norm model genetic parameter estimates according to different age and sex analyses. They confirmed the presence of an important genotype by environment by sex by age interaction for Nelore cattle weight. The patterns in these results lead to a revision of the importance of sexual and developmental factors on plasticity and adaptation concepts.
Authors:
N T Pegolo; L G Albuquerque; R B Lôbo; H N de Oliveira
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-1
Journal Detail:
Title:  Journal of animal science     Volume:  -     ISSN:  1525-3163     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Genetics, Faculdade de Medicina de Ribeirão Preto - Universidade de São Paulo, 14049-900, Ribeirão Preto, SP, Brazil.
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