Genetic parameters of milk, fat, and protein yields in the first three lactations, using an animal model and restricted maximum likelihood

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversity of Nebraska-
Autor(es): dc.creatorAlbuquerque, L. G.-
Autor(es): dc.creatorKeown, J. F.-
Autor(es): dc.creatorVan Vleck, L. D.-
Data de aceite: dc.date.accessioned2025-08-21T19:11:22Z-
Data de disponibilização: dc.date.available2025-08-21T19:11:22Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued1996-03-01-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/224023-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/224023-
Descrição: dc.descriptionMilk, fat, and protein yields of Holstein cows from the States of New York and California in the United States were used to estimate (co)variances among yields in the first three lactations, using an animal model and a derivative-free restricted maximum likelihood (REML) algorithm, and to verify if yields in different lactations are the same trait. The data were split in 20 samples, 10 from each state, with means of 5463 and 5543 cows per sample from California and New York. Mean heritability estimates for milk, fat, and protein yields for California data were, respectively, 0.34, 0.35, and 0.40 for first; 0.31, 0.33, and 0.39 for second; and 0.28, 0.31, and 0.37 for third lactations. For New York data, estimates were 0.35, 0.40, and 0.34 for first; 0.34, 0.44, and 0.38 for second; and 0.32, 0.43, and 0.38 for third lactations. Means of estimates of genetic correlations between first and second, first and third, and second and third lactations for California data were 0.86, 0.77, and 0.96 for milk; 0.89, 0.84, and 0.97 for fat; and 0.90, 0.84, and 0.97 for protein yields. Mean estimates for New York data were 0.87, 0.81, and 0.97 for milk; 0.91, 0.86, and 0.98 for fat; and 0.88, 0.82, and 0.98 for protein yields. Environmental correlations varied from 0.30 to 0.50 and were larger between second and third lactations. Phenotypic correlations were similar for both states and varied from 0.52 to 0.66 for milk, fat and protein yields. These estimates are consistent with previous estimates obtained with animal models. Yields in different lactations are not statistically the same trait but for selection programs such yields can be modelled as the same trait because of the high genetic correlations.-
Descrição: dc.descriptionDepartamento de Melhoramento Genético Animal Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal (FCAVJ) Universidade Estadual Paulista (UNESP), 14870-000 Jaboticabal, SP-
Descrição: dc.descriptionDepartment of Animal Science University of Nebraska, Lincoln, NE 68583-0908-
Descrição: dc.descriptionRoman L. Hruska US Meat Animal Research Center USDA A218 Animal Sciences University of Nebraska, Lincoln, NE 68583-0908-
Descrição: dc.descriptionDepartamento de Melhoramento Genético Animal Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal (FCAVJ) Universidade Estadual Paulista (UNESP), 14870-000 Jaboticabal, SP-
Formato: dc.format79-86-
Idioma: dc.languageen-
Relação: dc.relationBrazilian Journal of Genetics-
???dc.source???: dc.sourceScopus-
Título: dc.titleGenetic parameters of milk, fat, and protein yields in the first three lactations, using an animal model and restricted maximum likelihood-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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