Phenotypic plasticity of composite beef cattle performance using reaction norms model with unknown covariate.

SANTANA JÚNIOR, M. L.; ELER, J. P.; CARDOSO, F. F.; ALBUQUERQUE, L. G.; FERRAZ, J. B. S.

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Campo DC	Valor	Idioma
dc.contributor.author	SANTANA JÚNIOR, M. L.	pt_BR
dc.contributor.author	ELER, J. P.	pt_BR
dc.contributor.author	CARDOSO, F. F.	pt_BR
dc.contributor.author	ALBUQUERQUE, L. G.	pt_BR
dc.contributor.author	FERRAZ, J. B. S.	pt_BR
dc.date.accessioned	2012-11-20T11:11:11Z	pt_BR
dc.date.available	2012-11-20T11:11:11Z	pt_BR
dc.date.created	2012-11-20	pt_BR
dc.date.issued	2013	pt_BR
dc.identifier.citation	Animal, Cambridge, v. 7, n. 2, p. 202-210, Feb. 2013.	pt_BR
dc.identifier.issn	1751-732X	pt_BR
dc.identifier.uri	http://www.alice.cnptia.embrapa.br/alice/handle/doc/940020	pt_BR
dc.description	The objective of the present study was to determine the presence of genotype by environment interaction (G × E) and to characterize the phenotypic plasticity of birth weight (BW), weaning weight (WW), postweaning weight gain (PWG) and yearling scrotal circumference (SC) in composite beef cattle using the reaction norms model with unknown covariate. The animals were born between 1995 and 2008 on 33 farms located throughout all Brazilian biomes between latitude −7° and −31°, longitude −40° and −63°. The contemporary group was chosen as the environmental descriptor, that is, the environmental covariate of the reaction norms. In general, higher estimates of direct heritability were observed in extreme favorable environments. The mean of direct heritability across the environmental gradient ranged from 0.05 to 0.51, 0.09 to 0.43, 0.01 to 0.43 and from 0.12 to 0.26 for BW, WW, PWG and SC, respectively. The variation in direct heritability observed indicates a different response to selection according to the environment in which the animals of the population are evaluated. The correlation between the level and slope of the reaction norm for BW and PWG was high, indicating that animals with higher average breeding values responded better to improvement in environmental conditions, a fact characterizing a scale of G × E. Low correlation between the intercept and slope was obtained for WW and SC, implying re-ranking of animals in different environments. Genetic variation exists in the sensitivity of animals to the environment, a fact that permits the selection of more plastic or robust genotypes in the population studied. Thus, the G × E is an important factor that should be considered in the genetic evaluation of the present population of composite beef cattle.	pt_BR
dc.language.iso	eng	eng
dc.rights	openAccess	eng
dc.title	Phenotypic plasticity of composite beef cattle performance using reaction norms model with unknown covariate.	pt_BR
dc.type	Artigo de periódico	pt_BR
dc.date.updated	2013-06-24T11:11:11Z	pt_BR
dc.subject.thesagro	Gado de corte	pt_BR
dc.description.notes	Firstview article 27 set. 2012.	pt_BR
riaa.ainfo.id	940020	pt_BR
riaa.ainfo.lastupdate	2013-06-24	pt_BR
dc.contributor.institution	UNIVERSIDADE FEDERAL DE MATO GROSSO; USP; FERNANDO FLORES CARDOSO, CPPSUL; UNIVERSIDADE ESTADUAL PAULISTA; USP.	pt_BR
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