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| Registros recuperados: 13 | |
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| Riley,David G.; Gill,Clare A.; Herring,Andy D.; Riggs,Penny K.; Sawyer,Jason E.; Sanders,James O.. |
| Gestation length, birth weight, and weaning weight of F2 Nelore-Angus calves (n = 737) with designed extensive full-sibling and half-sibling relatedness were evaluated for association with 34,957 SNP markers. In analyses of birth weight, random relatedness was modeled three ways: 1) none, 2) random animal, pedigree-based relationship matrix, or 3) random animal, genomic relationship matrix. Detected birth weight-SNP associations were 1,200, 735, and 31 for those parameterizations respectively; each additional model refinement removed associations that apparently were a result of the built-in stratification by relatedness. Subsequent analyses of gestation length and weaning weight modeled genomic relatedness; there were 40 and 26 trait-marker associations... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Birth weight; Gestation length; Weaning weight; Nelore; Whole genome association. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000400007 |
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| ALENCAR, M. M. de; THOLON, P.; HENRIQUE, W.; ESTEVES, S. N.. |
| A utilização de cruzamentos em ovinos de corte vem sendo uma alternativa para explorar o potencial genético de raças com aptidão para corte, aliado à características adaptativas em ambientes tropicais. Assim, objetivou-se avaliar os pesos ao nascimento (PN) e à desmama ajustado pela idade (PDA) e o ganho médio diário de peso do nascimento à desmama (GMD) em animais Santa Inês e cruzados de Santa Inês (S) com Dorper, Ile de France e Texel. Foi realizada análise de variância das características com modelo estatístico que incluiu os efeitos principais de safra, grupo genético do cordeiro, sexo do cordeiro e tipo de parto, além da covariável idade ao desmame para o peso ao desmame. Os machos foram mais pesados do que as fêmeas e os animais provenientes de... |
| Tipo: Separatas |
Palavras-chave: Ganho médio diário; Peso ao nascimento; Peso à desmama; Santa Inês; Daily weight gain; Ovino de corte; Birth weight; Weaning weight. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1110265 |
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| Mezzadra,Carlos Alberto; Melucci,Lilia Magdalena; Corva,Pablo Marcelo; López Valiente,Sebastián; Rípoli,María Verónica; Lirón,Pedro; Giovambattista,Guillermo. |
| The influence of cytoplasmic inheritance on birth and weaning weight was evaluated in an experimental Hereford herd. Data on 1,720 records for birth and weaning weights from calves born between 1963 and 2002 were studied. Variance components were estimated using MTDFREML procedures and an animal model was fitted for each trait. Direct and maternal additive effects and permanent environment and maternal lineage effects were treated as random, while year and month of birth, age of dam and sex of the calf were treated as fixed. Identification of maternal lineages was based on pedigree information. The contribution to phenotypic variance of cytoplasmic lineages defined by pedigree information was negligible for both traits. Mitochondrial genotypes of cows... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Hereford; Birth weight; Weaning weight; Cytoplasmic inheritance; SSCP. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000300003 |
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| SOUZA, J. C.; SILVA, L. O. C. da; RAMOS, K. E. F. A. de; ALENCAR, M. M. de; GADINI, C. H.; VELAZSCO GUTIERREZ, R. R.; VLECK, L. D. van. |
| Records on 105 465 Nellore calves born from 1977 to 1994 in eight regions of Brazil were studied to evaluate the effects fo genotype x environment interaction on weaning weight calves. Teh interactions were estimated by the genetic correlation of weaning weight in defferent regions. To eastimate the variance and covariance components to obtain the genetic correlation of weaning weight under different regions, a sire model and MTDFREML solftware wereused for two regions each time. The matematical model included the fixed effects of year(17) and month(12),sex(2) of calf, farm(419) and age of dam (covarable), and the random effect of sire(588) and dam (57 162). The sire components of variance for each of the regions where 20.33,28.08,17.72,29.80,34.36, 38.08,... |
| Tipo: Artigo de periódico |
Palavras-chave: Nelore; Peso ao destete; Genetic parameter; Gado de Corte; Parâmetro Genético; Nellore; Weaning weight. |
| Ano: 1997 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/44151 |
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| SOUZA, J. C. de; RAMOS, A. de A.; SILVA, L. O. C. da; EUCLIDES FILHO, K.; ALENCAR, M. M. de; WECHSLER, F. S.; FERRAZ FILHO, P. B.. |
| Este trabalho teve o objetivo de estudar a influencia de efeitos nao geneticos sobre o peso ao desmame de 105.465 bezerros da raca Nelore, nascidos em oito diferentes regioes brasileiras, no periodo de 1978 a 1994. A analise estatisticas foi realizada utilizando-se o metodo dos quadrados minimos, procedimentos GLM (SAS. 1996), com um modelo estatistico contendo como fontes de variacao os efeitos fixos de sexo, mes e ano de nascimento do bezerro, regiao, fazenda dentro de regiao, grupo de idade da vaca e, como efeitos aleatorios, touro e o erro. Todas as fontes de variacao do modelo foram significativas (P<0,0001). A importancia desses efeitos nao geneticos sobre o peso aos 205 dias de idade de bezerros da raca Nelore evidenciam a necessidade de se fazer... |
| Tipo: Artigo de periódico |
Palavras-chave: Bovino de corte; Nelore; Ambiente; Regiao tropical; Brasil; Tropical region; Bezerro; Desmama; Peso; Nellore; Brazil; Beef cattle; Calves; Environmental factors; Weaning weight. |
| Ano: 2000 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/323702 |
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| TORAL, F. L. B.; TORRES JÚNIOR, R. A. de A.; LOPES, P. S.; SILVA, L. O. C. da; REIS FILHO, J. C.. |
| ABSTRACT - The objective of this study was to evaluate alternatives for modeling the age of dam at calving (AOD) effect on the weaning weight of Charolais-Zebu crossbred calves. Data from 56,965 calves were analyzed, using statistical models considering the fixed effects of the contemporary groups, sire and dam genetic groups, and AOD. The AOD effect was fitted to models using annual age classes, and ordinary quadratic to quintic-ordered polynomials (OP) or segmented polynomials (SP) with two, three, four, six and twelve evenly spaced intervals. In the case of segmented polynomials, general linear and quadratic effects and only one quadratic additional term from each knot were considered. The AOD effects were nested within sex of calf in all cases.... |
| Tipo: Artigo de periódico |
Palavras-chave: Análise Estatística; Bezerro Mestiço; Gado Charolês; Gado de Corte; Impacto Ambiental; Melhoramento Genético Animal; Seleção Genética; Vaca; Beef cattle; Charolais; Least squares; Statistical models; Weaning weight. |
| Ano: 2009 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/578222 |
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| Lopes,Jader Silva; Rorato,Paulo Roberto Nogara; Weber,Tomás; Araújo,Ronyere Olegário de; Dornelles,Mariana de Almeida; Comin,Juliana Grigolleto. |
| This work aimed at estimating the genetic effects that affect the pre-weaning performance of animals from multibreed crosses. In order to do so, it was used information of the weight at weaning of 79,521 animals, sired by 1,020 bulls and 61,898 cows from Aberdeen Angus and Nellore breeds and from many genetic groups resulted from their crosses. Five genetic models were tested: model 1, containing the fixed breed genetic effects (additive direct and maternal effects, heterozygote direct and maternal effects, epystatic direct and maternal effects, joint additive direct and maternal effects); model 2, equal to model 1, excluding direct and maternal joint additive effects; model 3, equal to model 1, excluding direct and maternal epystatic effects; model 4,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Additive effect; Complementarity among breeds; Epistasis; Heterozygous; Multicollinearity; Weaning weight. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100014 |
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| Registros recuperados: 13 | |
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