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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
05/10/2010 |
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Data da última atualização: |
30/06/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BALDI, F.; ALBUQUERQUE, L. G.; ALENCAR, M. M. de. |
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Afiliação: |
FERNANDO BALDI, UNESP/JABOTICABAL; LUCIA G. ALBUQUERQUE, UNESP/JABOTICABAL; MAURICIO MELLO DE ALENCAR, CPPSE. |
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Título: |
Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Journal of Animal Breeding and Genetics, v. 127, n. 4, p. 289-299, 2010 |
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Idioma: |
Português |
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Conteúdo: |
The objective of this work was to estimate covariance functions for direct and maternal genetic effects, animal and maternal permanent environmental effects, and subsequently, to derive relevant genetic parameters for growth traits in Canchim cattle. Data comprised 49 011 weight records on 2435 females from birth to adult age. The model of analysis included fixed effects of contemporary groups (year and month of birth and at weighing) and age of dam as quadratic covariable. Mean trends were taken into account by a cubic regression on orthogonal polynomials of animal age. Residual variances were allowed to vary and were modelled by a step function with 1, 4 or 11 classes based on animal's age. The model fitting four classes of residual variances was the best. A total of 12 random regression models from second to seventh order were used to model direct and maternal genetic effects, animal and maternal permanent environmental effects. The model with direct and maternal genetic effects, animal and maternal permanent environmental effects fitted by quadric, cubic, quintic and linear Legendre polynomials, respectively, was the most adequate to describe the covariance structure of the data. Estimates of direct and maternal heritability obtained by multi-trait (seven traits) and random regression models were very similar. Selection for higher weight at any age, especially after weaning, will produce an increase in mature cow weight. The possibility to modify the growth curve in Canchim cattle to obtain animals with rapid growth at early ages and moderate to low mature cow weight is limited. MenosThe objective of this work was to estimate covariance functions for direct and maternal genetic effects, animal and maternal permanent environmental effects, and subsequently, to derive relevant genetic parameters for growth traits in Canchim cattle. Data comprised 49 011 weight records on 2435 females from birth to adult age. The model of analysis included fixed effects of contemporary groups (year and month of birth and at weighing) and age of dam as quadratic covariable. Mean trends were taken into account by a cubic regression on orthogonal polynomials of animal age. Residual variances were allowed to vary and were modelled by a step function with 1, 4 or 11 classes based on animal's age. The model fitting four classes of residual variances was the best. A total of 12 random regression models from second to seventh order were used to model direct and maternal genetic effects, animal and maternal permanent environmental effects. The model with direct and maternal genetic effects, animal and maternal permanent environmental effects fitted by quadric, cubic, quintic and linear Legendre polynomials, respectively, was the most adequate to describe the covariance structure of the data. Estimates of direct and maternal heritability obtained by multi-trait (seven traits) and random regression models were very similar. Selection for higher weight at any age, especially after weaning, will produce an increase in mature cow weight. The possibility to modify the growth curve in Canc... Mostrar Tudo |
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Palavras-Chave: |
Covariance functions; Growth curve; Legendre polynomials. |
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Thesaurus Nal: |
beef cattle. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02257naa a2200193 a 4500
001 1863661
005 2023-06-30
008 2010 bl uuuu u00u1 u #d
100 1 $aBALDI, F.
245 $aRandom regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle.$h[electronic resource]
260 $c2010
520 $aThe objective of this work was to estimate covariance functions for direct and maternal genetic effects, animal and maternal permanent environmental effects, and subsequently, to derive relevant genetic parameters for growth traits in Canchim cattle. Data comprised 49 011 weight records on 2435 females from birth to adult age. The model of analysis included fixed effects of contemporary groups (year and month of birth and at weighing) and age of dam as quadratic covariable. Mean trends were taken into account by a cubic regression on orthogonal polynomials of animal age. Residual variances were allowed to vary and were modelled by a step function with 1, 4 or 11 classes based on animal's age. The model fitting four classes of residual variances was the best. A total of 12 random regression models from second to seventh order were used to model direct and maternal genetic effects, animal and maternal permanent environmental effects. The model with direct and maternal genetic effects, animal and maternal permanent environmental effects fitted by quadric, cubic, quintic and linear Legendre polynomials, respectively, was the most adequate to describe the covariance structure of the data. Estimates of direct and maternal heritability obtained by multi-trait (seven traits) and random regression models were very similar. Selection for higher weight at any age, especially after weaning, will produce an increase in mature cow weight. The possibility to modify the growth curve in Canchim cattle to obtain animals with rapid growth at early ages and moderate to low mature cow weight is limited.
650 $abeef cattle
653 $aCovariance functions
653 $aGrowth curve
653 $aLegendre polynomials
700 1 $aALBUQUERQUE, L. G.
700 1 $aALENCAR, M. M. de
773 $tJournal of Animal Breeding and Genetics$gv. 127, n. 4, p. 289-299, 2010
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Trigo. Para informações adicionais entre em contato com cnpt.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
27/04/2008 |
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Data da última atualização: |
27/04/2008 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Circulação/Nível: |
-- - -- |
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Autoria: |
EMYGDIO, B. M.; TEIXEIRA, M. C. C.; ACOSTA, A. da S.; KONFLANZ, V. |
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Afiliação: |
Mauro César Celaro Teixeira, Embrapa Trigo. |
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Título: |
Desempenho do híbrido de milho BRS 1015 em Santa Catarina - safra 2003/04 a 2006/07. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
In: REUNIÃO TÉCNICA CATARINENSE DE MILHO E FEIJÃO, 6., 2007, Concórdia. Resumos expandidos... Concórdia: Epagri: Cepaf, 2007. p. 182-185. |
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Idioma: |
Português |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00532naa a2200145 a 4500
001 1825602
005 2008-04-27
008 2007 bl uuuu u00u1 u #d
100 1 $aEMYGDIO, B. M.
245 $aDesempenho do híbrido de milho BRS 1015 em Santa Catarina - safra 2003/04 a 2006/07.
260 $c2007
700 1 $aTEIXEIRA, M. C. C.
700 1 $aACOSTA, A. da S.
700 1 $aKONFLANZ, V.
773 $tIn: REUNIÃO TÉCNICA CATARINENSE DE MILHO E FEIJÃO, 6., 2007, Concórdia. Resumos expandidos... Concórdia: Epagri: Cepaf, 2007. p. 182-185.
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