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Registro Completo |
Biblioteca(s): |
Embrapa Pantanal. |
Data corrente: |
20/03/2002 |
Data da última atualização: |
05/07/2018 |
Autoria: |
MARIANTE, A. da S. |
Afiliação: |
ARTHUR DA SILVA MARIANTE, Cenargen. |
Título: |
Growth and reproduction in Nellore cattle in Brazil: genetic parameters and effects of environmental factors. |
Ano de publicação: |
1978 |
Fonte/Imprenta: |
Florida: University of Florida, 1978. |
Páginas: |
133 p. |
Idioma: |
Inglês |
Notas: |
Ph.D. Dissertation. |
Conteúdo: |
The objectives of this study were to determine the effects of various genetic and environmental factors on growth traits and reproductive performance of a herd of Nellore cattle in central Brazil. Weights at birth and at weaning (8 mo.), 12, 18, and 24 months of age collected over a 15-year period from 2,282 calves, were analyzed by least squares methods. Least squares means for these weights were 30.2+-.7, 187.5+-.0, 215.5+-.3, 282.6+-2.8, and 354.9+-4.0 kg. Year and month of birth, sire and sex of calf affected (P<.01) weights at all ages. Age of dam had a significant (P<.10) effect on calf weight at 24 monts of age, and a highly significant effect on weights at the other ages. Heritability, estimated by paternal halfsib correlations, was .62+-.14, .12+-.14, .14+-.05, .13+-.05, and .18+-.06 for weight at birth, 8, 12, 18 and months, respectively. All genetic, phenotypic and environmental correlations between weights at different ages were positive. Correlations between weights tahen at ages closer together tended to be higher than those taken at more distant ages. Data from 335 calvings collected over an 11-year period were analyzed for age at first calving by least squares methods. The least squares mean for age at first calving was 40.3+-.7 months. Variables that significantly affected this traid were weight of the cow at birth, and at 8, 12, 18, and 24 months of age (P<.05), and sire of calf (P<.01). Heritability of age at first calving, estimated by paternal half-sib correlations, was .09+-12. Genetic... MenosThe objectives of this study were to determine the effects of various genetic and environmental factors on growth traits and reproductive performance of a herd of Nellore cattle in central Brazil. Weights at birth and at weaning (8 mo.), 12, 18, and 24 months of age collected over a 15-year period from 2,282 calves, were analyzed by least squares methods. Least squares means for these weights were 30.2+-.7, 187.5+-.0, 215.5+-.3, 282.6+-2.8, and 354.9+-4.0 kg. Year and month of birth, sire and sex of calf affected (P<.01) weights at all ages. Age of dam had a significant (P<.10) effect on calf weight at 24 monts of age, and a highly significant effect on weights at the other ages. Heritability, estimated by paternal halfsib correlations, was .62+-.14, .12+-.14, .14+-.05, .13+-.05, and .18+-.06 for weight at birth, 8, 12, 18 and months, respectively. All genetic, phenotypic and environmental correlations between weights at different ages were positive. Correlations between weights tahen at ages closer together tended to be higher than those taken at more distant ages. Data from 335 calvings collected over an 11-year period were analyzed for age at first calving by least squares methods. The least squares mean for age at first calving was 40.3+-.7 months. Variables that significantly affected this traid were weight of the cow at birth, and at 8, 12, 18, and 24 months of age (P<.05), and sire of calf (P<.01). Heritability of age at first calving, estimated by paternal half-sib ... Mostrar Tudo |
Palavras-Chave: |
Growth trait. |
Thesagro: |
Crescimento; Gado Nelore; Pecuária; Reprodução Animal; Zootecnia. |
Thesaurus Nal: |
Brazil; cattle breeding; reproduction; reproductive performance. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02254nam a2200253 a 4500 001 1790841 005 2018-07-05 008 1978 bl uuuu m 00u1 u #d 100 1 $aMARIANTE, A. da S. 245 $aGrowth and reproduction in Nellore cattle in Brazil$bgenetic parameters and effects of environmental factors. 260 $aFlorida: University of Florida$c1978 300 $a133 p. 500 $aPh.D. Dissertation. 520 $aThe objectives of this study were to determine the effects of various genetic and environmental factors on growth traits and reproductive performance of a herd of Nellore cattle in central Brazil. Weights at birth and at weaning (8 mo.), 12, 18, and 24 months of age collected over a 15-year period from 2,282 calves, were analyzed by least squares methods. Least squares means for these weights were 30.2+-.7, 187.5+-.0, 215.5+-.3, 282.6+-2.8, and 354.9+-4.0 kg. Year and month of birth, sire and sex of calf affected (P<.01) weights at all ages. Age of dam had a significant (P<.10) effect on calf weight at 24 monts of age, and a highly significant effect on weights at the other ages. Heritability, estimated by paternal halfsib correlations, was .62+-.14, .12+-.14, .14+-.05, .13+-.05, and .18+-.06 for weight at birth, 8, 12, 18 and months, respectively. All genetic, phenotypic and environmental correlations between weights at different ages were positive. Correlations between weights tahen at ages closer together tended to be higher than those taken at more distant ages. Data from 335 calvings collected over an 11-year period were analyzed for age at first calving by least squares methods. The least squares mean for age at first calving was 40.3+-.7 months. Variables that significantly affected this traid were weight of the cow at birth, and at 8, 12, 18, and 24 months of age (P<.05), and sire of calf (P<.01). Heritability of age at first calving, estimated by paternal half-sib correlations, was .09+-12. Genetic... 650 $aBrazil 650 $acattle breeding 650 $areproduction 650 $areproductive performance 650 $aCrescimento 650 $aGado Nelore 650 $aPecuária 650 $aReprodução Animal 650 $aZootecnia 653 $aGrowth trait
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Embrapa Pantanal (CPAP) |
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Registros recuperados : 263 | |
1. | | MARIANTE, A. da S. Os benefícios de conservar os recursos genéticos. In: SANTOS, M. G. B. dos. (Org). Artigos técnicos divulgados na mídia: coletânea 2007. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2007. (Embrapa Recursos Genéticos e Biotecnologia. Documentos, 244). Publicado em 03/08/2007. Disponível em: Portal DBO, dbo030807.Tipo: Artigo de Divulgação na Mídia |
Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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8. | | MARIANTE, A. da S. Recursos genéticos animais. In: ALBUQUERQUE, A. C. S.; SILVA, A. G. da (Ed.). Agricultura tropical: quatro décadas de inovações tecnológicas, institucionais e políticas. Brasília, DF: Embrapa Informação Tecnológica, 2008. Pt. 7. Cap. 2. v. 2 p. 665-678. il. Color.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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11. | | MARIANTE, A. da S. Conservacao de bovinos Crioulos no Brasil. In: PUIGNAU, J.P. ed. Evaluacion y eleccion de biotipos de acuerdo a los sistemas de produccion. Montevideo: IICA- PROCISUR, 1993. p.137-142. (IICA-PROCISUR. Dialogo, 35). p.137-142 (IICA-PROCISUR. Dialogo, 35)Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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Registros recuperados : 263 | |
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