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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
08/01/2016 |
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Data da última atualização: |
03/02/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CAMPOS, R. V.; COBUCI, J. A.; KERN, E. L.; COSTA, C. N.; McMANUS, C. M. |
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Afiliação: |
Rafael Viegas Campos; Jaime Araujo Cobuci; Elisandra Lurdes Kern; CLAUDIO NAPOLIS COSTA, CNPGL; Concepta Margaret McManus. |
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Título: |
Genetic parameters for linear type traits and milk, fat, and protein production in holstein cows in Brazil. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Asian-Australasian Journal of Animal Sciences, v. 28, n. 4, p. 476-484, 2015. |
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Idioma: |
Português |
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Conteúdo: |
The objective of this study was to estimate genetic and phenotypic parameters for linear type traits, as well as milk yield (MY), fat yield (FY) and protein yield (PY) in 18,831 Holstein cows reared in 495 herds in Brazil. Restricted maximum likelihood with a bivariate model was used for estimation genetic parameters, including fixed effects of herd-year of classification, period of classification, classifier and stage of lactation for linear type traits and herd-year of calving, season of calving and lactation order effects for production traits. The age of cow at calving was fitted as a covariate (with linear and quadratic terms), common to both models. Heritability estimates varied from 0.09 to 0.38 for linear type traits and from 0.17 to 0.24 for production traits, indicating sufficient genetic variability to achieve genetic gain through selection. In general, estimates of genetic correlations between type and production traits were low, except for udder texture and angularity that showed positive genetic correlations (>0.29) with MY, FY, and PY. Udder depth had the highest negative genetic correlation (-0.30) with production traits. Selection for final score, commonly used by farmers as a practical selection tool to improve type traits, does not lead to significant improvements in production traits, thus the use of selection indices that consider both sets of traits (production and type) seems to be the most adequate to carry out genetic selection of animals in the Brazilian herd. MenosThe objective of this study was to estimate genetic and phenotypic parameters for linear type traits, as well as milk yield (MY), fat yield (FY) and protein yield (PY) in 18,831 Holstein cows reared in 495 herds in Brazil. Restricted maximum likelihood with a bivariate model was used for estimation genetic parameters, including fixed effects of herd-year of classification, period of classification, classifier and stage of lactation for linear type traits and herd-year of calving, season of calving and lactation order effects for production traits. The age of cow at calving was fitted as a covariate (with linear and quadratic terms), common to both models. Heritability estimates varied from 0.09 to 0.38 for linear type traits and from 0.17 to 0.24 for production traits, indicating sufficient genetic variability to achieve genetic gain through selection. In general, estimates of genetic correlations between type and production traits were low, except for udder texture and angularity that showed positive genetic correlations (>0.29) with MY, FY, and PY. Udder depth had the highest negative genetic correlation (-0.30) with production traits. Selection for final score, commonly used by farmers as a practical selection tool to improve type traits, does not lead to significant improvements in production traits, thus the use of selection indices that consider both sets of traits (production and type) seems to be the most adequate to carry out genetic selection of animals in the Braz... Mostrar Tudo |
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Palavras-Chave: |
Functional Trait; Selection. |
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Thesaurus Nal: |
dairy cattle; genetic correlation; heritability. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/136843/1/Cnpgl-2015-AJAS-Genetic.pdf
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Marc: |
LEADER 02214naa a2200229 a 4500
001 2033399
005 2024-02-03
008 2015 bl uuuu u00u1 u #d
100 1 $aCAMPOS, R. V.
245 $aGenetic parameters for linear type traits and milk, fat, and protein production in holstein cows in Brazil.$h[electronic resource]
260 $c2015
520 $aThe objective of this study was to estimate genetic and phenotypic parameters for linear type traits, as well as milk yield (MY), fat yield (FY) and protein yield (PY) in 18,831 Holstein cows reared in 495 herds in Brazil. Restricted maximum likelihood with a bivariate model was used for estimation genetic parameters, including fixed effects of herd-year of classification, period of classification, classifier and stage of lactation for linear type traits and herd-year of calving, season of calving and lactation order effects for production traits. The age of cow at calving was fitted as a covariate (with linear and quadratic terms), common to both models. Heritability estimates varied from 0.09 to 0.38 for linear type traits and from 0.17 to 0.24 for production traits, indicating sufficient genetic variability to achieve genetic gain through selection. In general, estimates of genetic correlations between type and production traits were low, except for udder texture and angularity that showed positive genetic correlations (>0.29) with MY, FY, and PY. Udder depth had the highest negative genetic correlation (-0.30) with production traits. Selection for final score, commonly used by farmers as a practical selection tool to improve type traits, does not lead to significant improvements in production traits, thus the use of selection indices that consider both sets of traits (production and type) seems to be the most adequate to carry out genetic selection of animals in the Brazilian herd.
650 $adairy cattle
650 $agenetic correlation
650 $aheritability
653 $aFunctional Trait
653 $aSelection
700 1 $aCOBUCI, J. A.
700 1 $aKERN, E. L.
700 1 $aCOSTA, C. N.
700 1 $aMcMANUS, C. M.
773 $tAsian-Australasian Journal of Animal Sciences$gv. 28, n. 4, p. 476-484, 2015.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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