Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1033399
Título: Genetic parameters for linear type traits and milk, fat, and protein production in holstein cows in Brazil.
Autoria: CAMPOS, R. V.
COBUCI, J. A.
KERN, E. L.
COSTA, C. N.
McMANUS, C. M.
Afiliação: Rafael Viegas Campos; Jaime Araujo Cobuci; Elisandra Lurdes Kern; CLAUDIO NAPOLIS COSTA, CNPGL; Concepta Margaret McManus.
Ano de publicação: 2015
Referência: Asian-Australasian Journal of Animal Sciences, v. 28, n. 4, p. 476-484, 2015.
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.
NAL Thesaurus: genetic correlation
dairy cattle
heritability
Palavras-chave: Functional Trait
Selection
Tipo do material: Artigo de periódico
Acesso: openAccess
Aparece nas coleções:Artigo em periódico indexado (CNPGL)

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