Genetic and environmental effects on milk yield of Pitangueiras cattle

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dc.contributor.authorLôbo, R. B.
dc.contributor.authorDuarte, F. A.M.
dc.contributor.authorGonçalves, A. A.M.
dc.contributor.authorOliveira, J. A. [UNESP]
dc.contributor.authorWilcox, C. J.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversity of Florida
dc.date.accessioned2022-04-29T07:35:50Z
dc.date.available2022-04-29T07:35:50Z
dc.date.issued1984-01-01
dc.description.abstractData from 5270 lactation records of 1380 cows sired by 132 bulls and recorded from 1962 to 1977 were analysed. Statistical analyses, using least squares and maximum likelihood methods, showed significant effects for genetic group, age of cow, month and year of calving, and lactation length. Overall mean milk yield was 2780 kg (CV = 0·31) with mean lactation length of 281 days. Maximum production occurred in the fifth lactation (104 or 105 months of age at calving) with a yield of 1·3 times that of the first lactation. Repeatability estimated by intraclass correlation was 0·40 (s.e. 0·03). Heritability estimated from paternal half-sib correlation was 0·16 (s.e. 0·06). Overall results were very similar to those obtained from research with European breeds in temperate areas. © 1984, British Society of Animal Science. All rights reserved.en
dc.description.affiliationDepartment of Genetics Faculty of Medicine of Ribeirāo Preto USP, 14100 Ribeirāo Preto Sāo Paulo
dc.description.affiliationDepartment of Zootechny Faculty of Agronomy of Ilha Solteira UNESP, 15378 Ilha Solteira, Sāo Paulo
dc.description.affiliationDairy Science Department Institute of Food and Agricultural Science University of Florida, Gainesville, Florida 32611
dc.description.affiliationUnespDepartment of Zootechny Faculty of Agronomy of Ilha Solteira UNESP, 15378 Ilha Solteira, Sāo Paulo
dc.format.extent157-163
dc.identifierhttp://dx.doi.org/10.1017/S0003356100041787
dc.identifier.citationAnimal Production, v. 39, n. 2, p. 157-163, 1984.
dc.identifier.doi10.1017/S0003356100041787
dc.identifier.issn0003-3561
dc.identifier.scopus2-s2.0-84971969242
dc.identifier.urihttp://hdl.handle.net/11449/228159
dc.language.isoeng
dc.relation.ispartofAnimal Production
dc.sourceScopus
dc.titleGenetic and environmental effects on milk yield of Pitangueiras cattleen
dc.typeArtigo

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