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| 128. |  | VALLE, L. da C. S.; LOBATO NETO, J.; SOUTO, P. R. L.; VERNEQUE, R. da S. Producao de leite de vacas mesticas em pastagem de capim-elefante, (Pennisetum purpureum, Schum.), suplementadas com duas fontes de alimentos, na epoca seca. Brasilia: SBZ, 1987. p.57. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 24., 1987, Brasilia. Anais...| Biblioteca(s): Embrapa Gado de Leite. |
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| 136. | | ALVIM, M. J.; XAVIER, D. F.; VERNEQUE, R. da S.; BOTREL, M. de A. Resposta do tifton 85 a doses de nitrogênio e intervalos de cortes. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 12, p. 2345-2352, nov. 1999. Título em inglês: Response of tifton 85 to nitrogen doses and cutting intervals.| Biblioteca(s): Embrapa Unidades Centrais. |
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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. |
Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
06/12/2011 |
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Data da última atualização: |
13/10/2015 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
PANETTO, J. C. do C.; VAL, J. C.; MARCONDES, C. R.; PEIXOTO, M. G. C. D.; VERNEQUE, R. da S.; FERRAZ, B. S.; GOLDEN, B. L. |
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Afiliação: |
JOAO CLAUDIO DO CARMO PANETTO, CNPGL; FACULDADE DE MEDICINA DE RIBEIRÃO PRETO/RIBEIRÃO PRETO; CINTIA RIGHETTI MARCONDES, CPPSE; MARIA GABRIELA CAMPOLINA D PEIXOTO, CNPGL; RUI DA SILVA VERNEQUE, CNPGL; FACULDADE DE ZOOTECNIA E ENGENHARIA DE ALIMENTOS-USP/PIRASSUNUNGA; POLYTECHNIC STATE UNIVERSITY/SAN LUIS OBISPO. |
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Título: |
Female fertility in a Guzerat dairy herd: Heterogeneity of variance components for calving intervals. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Journal Animal Science, v. 89, (E-Suppl. 1); Journal of Dairy Science, v. 94, (E-Suppl. 1), p.25, 2011 |
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Idioma: |
Português |
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Conteúdo: |
Our objectives were to determine if variance components of calving intervals varied with age and if considering calving intervals as a longitudinal trait would be a superior approach for fertility analysis of zebu dairy herds. Calving records from females born from 1940 to 2006 in a Guzerat dairy subpopulation in Brazil were analyzed in the present study. Contemporary groups, formed by year and farm at birth or at calving, ages at calving, equivalent inbreeding coefficients and day of the year were included as fixed effects in the models. Calving interval (CI) was first analyzed by fitting a random regression model with Legendre polynomials of order 3 for the fixed effect of age at calving, and random effects of animal and permanent environment. In a second approach, a multivariate analysis was conducted, includingage at first calving (AFC), first calving interval (CI1), calving interval for young females (CIY) and calving interval for mature females (CIM). Finally, a bivariate analysis was performed for AFC and CIwhere calving intervals were considered as a single trait in a repeatability model. Additionally, ranking of sires were compared among approaches. Calving intervals decreased with age until females were about 80 mo old, remaining nearly constant after that age. A quasilinear increase of 11.5 d on the calving intervals was observed for each 10% increase in the female?s equivalent inbreeding coefficient. Heritability of AFC was 0.37 from both analyses. In the case of CI,the genetic variance ratios ranged from 0.064 to 0.141, depending onthe approach and on the ages at calving. Differences among genetic variance components for calving intervals observed along the animal′slifetime confirmed the longitudinal aspect of this trait, indicating the importance of such consideration when accessing fertility of zebu dairy females in situations where the available information relies ontheir calving intervals. Changes observed in the ranking of sires suggested that the genetic progress of the population can be affected bythe approach chosen for the analysis of calving intervals MenosOur objectives were to determine if variance components of calving intervals varied with age and if considering calving intervals as a longitudinal trait would be a superior approach for fertility analysis of zebu dairy herds. Calving records from females born from 1940 to 2006 in a Guzerat dairy subpopulation in Brazil were analyzed in the present study. Contemporary groups, formed by year and farm at birth or at calving, ages at calving, equivalent inbreeding coefficients and day of the year were included as fixed effects in the models. Calving interval (CI) was first analyzed by fitting a random regression model with Legendre polynomials of order 3 for the fixed effect of age at calving, and random effects of animal and permanent environment. In a second approach, a multivariate analysis was conducted, includingage at first calving (AFC), first calving interval (CI1), calving interval for young females (CIY) and calving interval for mature females (CIM). Finally, a bivariate analysis was performed for AFC and CIwhere calving intervals were considered as a single trait in a repeatability model. Additionally, ranking of sires were compared among approaches. Calving intervals decreased with age until females were about 80 mo old, remaining nearly constant after that age. A quasilinear increase of 11.5 d on the calving intervals was observed for each 10% increase in the female?s equivalent inbreeding coefficient. Heritability of AFC was 0.37 from both analyses. In the case of... Mostrar Tudo |
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Palavras-Chave: |
Guzerat; Varianace components. |
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Thesaurus NAL: |
dairy cattle; female fertility. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 02844nam a2200229 a 4500
001 1908742
005 2015-10-13
008 2011 bl uuuu u00u1 u #d
100 1 $aPANETTO, J. C. do C.
245 $aFemale fertility in a Guzerat dairy herd$bHeterogeneity of variance components for calving intervals.
260 $aJournal Animal Science, v. 89, (E-Suppl. 1); Journal of Dairy Science, v. 94, (E-Suppl. 1), p.25$c2011
520 $aOur objectives were to determine if variance components of calving intervals varied with age and if considering calving intervals as a longitudinal trait would be a superior approach for fertility analysis of zebu dairy herds. Calving records from females born from 1940 to 2006 in a Guzerat dairy subpopulation in Brazil were analyzed in the present study. Contemporary groups, formed by year and farm at birth or at calving, ages at calving, equivalent inbreeding coefficients and day of the year were included as fixed effects in the models. Calving interval (CI) was first analyzed by fitting a random regression model with Legendre polynomials of order 3 for the fixed effect of age at calving, and random effects of animal and permanent environment. In a second approach, a multivariate analysis was conducted, includingage at first calving (AFC), first calving interval (CI1), calving interval for young females (CIY) and calving interval for mature females (CIM). Finally, a bivariate analysis was performed for AFC and CIwhere calving intervals were considered as a single trait in a repeatability model. Additionally, ranking of sires were compared among approaches. Calving intervals decreased with age until females were about 80 mo old, remaining nearly constant after that age. A quasilinear increase of 11.5 d on the calving intervals was observed for each 10% increase in the female?s equivalent inbreeding coefficient. Heritability of AFC was 0.37 from both analyses. In the case of CI,the genetic variance ratios ranged from 0.064 to 0.141, depending onthe approach and on the ages at calving. Differences among genetic variance components for calving intervals observed along the animal′slifetime confirmed the longitudinal aspect of this trait, indicating the importance of such consideration when accessing fertility of zebu dairy females in situations where the available information relies ontheir calving intervals. Changes observed in the ranking of sires suggested that the genetic progress of the population can be affected bythe approach chosen for the analysis of calving intervals
650 $adairy cattle
650 $afemale fertility
653 $aGuzerat
653 $aVarianace components
700 1 $aVAL, J. C.
700 1 $aMARCONDES, C. R.
700 1 $aPEIXOTO, M. G. C. D.
700 1 $aVERNEQUE, R. da S.
700 1 $aFERRAZ, B. S.
700 1 $aGOLDEN, B. L.
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