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| 6. |  | OLIVEIRA JÚNIOR, O. de P.; CUNHA, C. A. da; WANDER, A. E. Análise dos canais de distribuição e dos custos de transação da cadeia produtiva da mandioca no município de Jussara-GO. In: CONGRESSO DA SOCIEDADE BRASILEIRA DE ECONOMIA, ADMINISTRAÇÃO E SOCIOLOGIA RURAL, 51., 2013, Belém, PA. Novas fronteiras da agropecuária no Brasil e na Amazônia: desafios da sustentabilidade. Belém, PA: SOBER, 2013.| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 8. | | OLIVEIRA JUNIOR, O. de P.; SOUZA, C. B. de; CRUZ, J. E.; WANDER, A. E.; CUNHA, C. A. Transaction costs in cassava production chain: the case of Araguaia Valley region (Goias State, Brazil). In: TROPENTAG 2019: INTERNATIONAL CONFERENCE ON RESEARCH ON FOOD SECURITY, NATURAL RESOURCE MANAGEMENT AND RURAL DEVELOPMENT, Kassel, 2019. Filling gaps and removing traps for sustainable resources management: book of abstracts. Göttingen: Cuvilier, 2019. p. 469.| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 9. | | OLIVEIRA JÚNIOR, O. de P.; WANDER, A. E.; CUNHA, C. A. da; COSTA FILHO, B. A. da; SOUZA, C. B. de. Análise dos canais de distribuição na cadeia produtiva da mandioca: o caso da Região do Vale do Araguaia (Goiás, Brasil). Revista de Administração e Negócios da Amazônia, v. 8, n. 3, p. 315-337, set./dez. 2016.| Biblioteca(s): Embrapa Arroz e Feijão. |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
28/09/1999 |
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Data da última atualização: |
29/09/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
COSTA, C. N. |
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Afiliação: |
CNPGL. |
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Título: |
An investigation into heterogeneity of variance for milk and fat yields of holstein cows in Brazilian herd environments. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Genetics and Molecular Biology, v. 22, n. 3, p. 375-381, 1999. |
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DOI: |
https://doi.org/10.1590/S1415-47571999000300015 |
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Idioma: |
Inglês |
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Conteúdo: |
Heterogeneity of variance in Brazilian herd environments was studied using first-lactation 305-day mature equivalent (ME) milk and fat records of Holstein cows. Herds were divided into two categories, according to low or high herd-year phenotypic standard deviation for ME milk (HYSD). There were 330 sires with daughter records in both HYSD categories. Components of (co)variance, heritability, and genetic correlations for milk and fat yields were estimated using a sire model from bivariate analyses with a restricted maximum likelihood (REML) derivative-free algorithm. Sire and residual variances for milk yield in low HYSD herds were 79 and 57% of those obtained in high HYSD herd. For fat yield they were 67 and 60%, respectively. Heritabilities for milk and fat yields in low HYSD herds were larger (0.30 and 0.22) than in high HYSD herds (0.23 and 0.20). Genetic correlation between expression in low and high HYSD herds was 0.997 for milk yield and 0.985 for fat yield. Expected correlated response in low HYSD herds based on sires selected on half-sister information from high HYSD was 0.89 kg/kg for milk and 0.80 kg/kg for fat yield. Genetic evaluations in Brazil need to account for heterogeneity of variances to increase the accuracy of evaluations and the selection efficiency for milk and fat yields of Holstein cows. Selection response will be lower in low variance herds than in high variance herds because of reduced differences in daughter response and among breeding values of sires in low HYSD herds. Genetic investments in sire selection to improve production are more likely to be successful in high HYSD herds than in low HYSD Brazilian herds. MenosHeterogeneity of variance in Brazilian herd environments was studied using first-lactation 305-day mature equivalent (ME) milk and fat records of Holstein cows. Herds were divided into two categories, according to low or high herd-year phenotypic standard deviation for ME milk (HYSD). There were 330 sires with daughter records in both HYSD categories. Components of (co)variance, heritability, and genetic correlations for milk and fat yields were estimated using a sire model from bivariate analyses with a restricted maximum likelihood (REML) derivative-free algorithm. Sire and residual variances for milk yield in low HYSD herds were 79 and 57% of those obtained in high HYSD herd. For fat yield they were 67 and 60%, respectively. Heritabilities for milk and fat yields in low HYSD herds were larger (0.30 and 0.22) than in high HYSD herds (0.23 and 0.20). Genetic correlation between expression in low and high HYSD herds was 0.997 for milk yield and 0.985 for fat yield. Expected correlated response in low HYSD herds based on sires selected on half-sister information from high HYSD was 0.89 kg/kg for milk and 0.80 kg/kg for fat yield. Genetic evaluations in Brazil need to account for heterogeneity of variances to increase the accuracy of evaluations and the selection efficiency for milk and fat yields of Holstein cows. Selection response will be lower in low variance herds than in high variance herds because of reduced differences in daughter response and among breeding values of ... Mostrar Tudo |
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Palavras-Chave: |
t. |
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Thesagro: |
Gado Holandês; Produção Leiteira. |
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Categoria do assunto: |
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L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/593700/1/An-investigation-into-heterogeneity-of-variance-for-milk-and-fat-yields-of-hosteins-cows-in-Brazilian-herd-environments.pdf
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Marc: |
LEADER 02251naa a2200169 a 4500
001 1593700
005 2022-09-29
008 1999 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1590/S1415-47571999000300015$2DOI
100 1 $aCOSTA, C. N.
245 $aAn investigation into heterogeneity of variance for milk and fat yields of holstein cows in Brazilian herd environments.$h[electronic resource]
260 $c1999
520 $aHeterogeneity of variance in Brazilian herd environments was studied using first-lactation 305-day mature equivalent (ME) milk and fat records of Holstein cows. Herds were divided into two categories, according to low or high herd-year phenotypic standard deviation for ME milk (HYSD). There were 330 sires with daughter records in both HYSD categories. Components of (co)variance, heritability, and genetic correlations for milk and fat yields were estimated using a sire model from bivariate analyses with a restricted maximum likelihood (REML) derivative-free algorithm. Sire and residual variances for milk yield in low HYSD herds were 79 and 57% of those obtained in high HYSD herd. For fat yield they were 67 and 60%, respectively. Heritabilities for milk and fat yields in low HYSD herds were larger (0.30 and 0.22) than in high HYSD herds (0.23 and 0.20). Genetic correlation between expression in low and high HYSD herds was 0.997 for milk yield and 0.985 for fat yield. Expected correlated response in low HYSD herds based on sires selected on half-sister information from high HYSD was 0.89 kg/kg for milk and 0.80 kg/kg for fat yield. Genetic evaluations in Brazil need to account for heterogeneity of variances to increase the accuracy of evaluations and the selection efficiency for milk and fat yields of Holstein cows. Selection response will be lower in low variance herds than in high variance herds because of reduced differences in daughter response and among breeding values of sires in low HYSD herds. Genetic investments in sire selection to improve production are more likely to be successful in high HYSD herds than in low HYSD Brazilian herds.
650 $aGado Holandês
650 $aProdução Leiteira
653 $at
773 $tGenetics and Molecular Biology$gv. 22, n. 3, p. 375-381, 1999.
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Embrapa Gado de Leite (CNPGL) |
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