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	Provedor de dados Genet. Mol. Biol. (3) Autor Oliveira,Henrique N. (3) Lôbo,Raysildo B. (2) Albuquerque,Lúcia G. (1) Alencar,Maurício M. (1) Bezerra,Luiz Antonio F. (1) Bijma,Piter (1) Casas,Eduardo (1) Coutinho,Luis L. (1) Machado,Mariana B.B. (1) Pereira,Andréa P. (1) Pégolo,Newton T. (1) Regitano,Luciana C.A. (1) Rosa,Artur J.M. (1) van Arendonk,Johan A.M. (1) Mais... Palavra-chave Age at first calving (1) Beef cattle (1) Bovine (1) Genotype by environment interaction (1) Growth (1) Growth traits (1) Marker-assisted selection (1) Microsatellite (1) Plasticity (1) Pre-selection (1) QTL (1) Quantitative trait loci (1) Random regression (1) Robustness (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2009 (1) 2007 (1) 2003 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última A deterministic simulation study of embryo marker-assisted selection for age at first calving in Nellore (Bos indicus) beef cattle Genet. Mol. Biol. Rosa,Artur J.M.; Bijma,Piter; Oliveira,Henrique N.; Lôbo,Raysildo B.; van Arendonk,Johan A.M.. We used deterministic simulation of four alternative multiple ovulation and embryo manipulation (MOET) closed nucleus schemes to investigate the benefits of using marker-assisted selection (MAS) of Nellore (Bos indicus) beef cattle embryos prior to transplantation to reduce the age at first calving (AFC). We found that MAS resulted in increased genetic gain as compared to selection without AFC quantitative trait loci (AFC-QTL) information. With single-stage selection the genetic response (GR) increased as follows: GR = 0.68% when the AFC-QTL explained 0.02 of the AFC additive genetic variance (sigma2A); GR = 1.76% for AFC-QTL explaining 0.05 sigma2A; GR = 3.7% for AFC-QTL explaining 0.1 sigma2A; and GR = 55.76% for AFC-QTL explaining 0.95 sigma2A. At the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Age at first calving; Beef cattle; Marker-assisted selection; Pre-selection; Quantitative trait loci. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000400008 Genotype by environment interaction for 450-day weight of Nelore cattle analyzed by reaction norm models Genet. Mol. Biol. Pégolo,Newton T.; Oliveira,Henrique N.; Albuquerque,Lúcia G.; Bezerra,Luiz Antonio F.; Lôbo,Raysildo B.. Genotype by environment interactions (GEI) have attracted increasing attention in tropical breeding programs because of the variety of production systems involved. In this work, we assessed GEI in 450-day adjusted weight (W450) Nelore cattle from 366 Brazilian herds by comparing traditional univariate single-environment model analysis (UM) and random regression first order reaction norm models for six environmental variables: standard deviations of herd-year (RRMw) and herd-year-season-management (RRMw-m) groups for mean W450, standard deviations of herd-year (RRMg) and herd-year-season-management (RRMg-m) groups adjusted for 365-450 days weight gain (G450) averages, and two iterative algorithms using herd-year-season-management group solution estimates... Tipo: Info:eu-repo/semantics/article Palavras-chave: Growth; Genotype by environment interaction; Plasticity; Random regression; Robustness. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200013 QTL affecting body weight in a candidate region of cattle chromosome 5 Genet. Mol. Biol. Machado,Mariana B.B.; Alencar,Maurício M.; Pereira,Andréa P.; Oliveira,Henrique N.; Casas,Eduardo; Coutinho,Luis L.; Regitano,Luciana C.A.. The objective of this work was to identify QTLs for liveweight in a candidate region of bovine chromosome 5. Half-sib families from two lines, one traditional and the other new, of Canchim beef cattle (5/8 Charolais + 3/8 Zebu) were genotyped for four microsatellite markers, including the microsatellite in the IGF-1 (insulin-like growth factor-1) promoter region. Significant differences in allele distribution between the two lines were found for three markers. Interval mapping analyses in this region indicated the presence of a QTL controlling birth weight (p < 0.05) and of a QTL influencing breeding value for yearling weight (p < 0.01) in the newer line of the breed. The previously identified interaction between the IGF-1 genotype and genetic group... Tipo: Info:eu-repo/semantics/article Palavras-chave: QTL; Growth traits; Microsatellite; Bovine. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300008 Registros recuperados: 3 Primeira ... 1 ... Última

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