Genetic parameters for milk yield of Bubalus bubalis using unadjusted and adjusted milk production for days in milk

Autor: Tonhati, H. [UNESP], Baldi, F. S. [UNESP], Laureano, M. M.M. [UNESP], Albuquerque, L. G. [UNESP]
Přispěvatelé: Universidade Estadual Paulista (Unesp), Universidade Estadual Paulista (UNESP), CAPES
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Italian Journal of Animal Science, Vol 6, Iss 2s, Pp 310-313 (2010)
Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Scopus
ISSN: 1594-4077
Popis: Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2014-02-26T17:18:33Z No. of bitstreams: 1 WOS000207598400042.pdf: 120641 bytes, checksum: 956b0ad7b27c7f0d2d13df6f51dba419 (MD5) Made available in DSpace on 2014-02-26T17:18:33Z (GMT). No. of bitstreams: 1 WOS000207598400042.pdf: 120641 bytes, checksum: 956b0ad7b27c7f0d2d13df6f51dba419 (MD5) Previous issue date: 2007-01-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:18:02Z No. of bitstreams: 1 WOS000207598400042.pdf: 120641 bytes, checksum: 956b0ad7b27c7f0d2d13df6f51dba419 (MD5) Made available in DSpace on 2014-05-20T13:18:02Z (GMT). No. of bitstreams: 1 WOS000207598400042.pdf: 120641 bytes, checksum: 956b0ad7b27c7f0d2d13df6f51dba419 (MD5) Previous issue date: 2007-01-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The objectives of this study were to estimate genetic parameters for unadjusted and adjusted milk production for 270 and 305 days of lactation and, subsequently, to verify the coincidence of rank of 2%, 5%, 20% and 40% best sires selected based on both models. Complete lactations from 90 or 150 days of lactation to 270 or 350 days of lactation were considered in the analyses. Milk production was adjusted for lactation length by multiplicative correction factors, or by including lactation length as a covariable in the model. Heritabilities, genetic correlations and breeding values were estimated for each trait, and variance and covariance components were estimated by restricted maximum likelihood methodology. Heritability estimates varied from 0.16 to 0.27. Genetic correlations between unadjusted and adjusted milk production for lactation length were higher than 0.64. Heritabilities for adjusted milk production were higher than heritabilities for unadjusted milk production for lactation length. In situations with high selection intensity, probably, modifications will happen in the rank of bulls and/or in the bulls chosen for mating if records are adjusted or unadjusted for 305 days. Univ São Paulo State, Dept Zootecnia, Fac Ciências Agr & Vet, UNESP, BR-14884000 Jaboticabal, SP, Brazil CNPq, FAPESP, CAPES, Campinas, SP, Brazil Univ São Paulo State, Dept Zootecnia, Fac Ciências Agr & Vet, UNESP, BR-14884000 Jaboticabal, SP, Brazil
Databáze: OpenAIRE
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