Data/hora: 05/06/2024 18:31:25

Provedor de dados: | 65
País: | Brazil
Título: | Cluster analysis of breeding values for milk yield and lactation persistency in Guzerá cattle
Autores: | Cruz,Diego Augusto Campos da; Savegnago,Rodrigo Pelicioni; Santana,Annaíza Braga Bignardi; Peixoto,Maria Gabriela Campolina Diniz; Bruneli,Frank Angelo Tomita; Faro,Lenira El.
Data: | 2016-07-01
Ano: | 2016
Palavras-chave: | Breeding values; Lactation curve; Random regression.
Resumo: | ABSTRACT: The aim of this study was to explore the pattern of genetic lactation curves of Guzerá cattle using cluster analysis. Test-day milk yields of 5,274 first-lactation Guzerá cows were recorded in a progeny test. A total of 34,193 monthly records were analyzed with a random regression animal model using Legendre polynomials to fit additive genetic and permanent environmental random effects and mean trends. Hierarchical and non-hierarchical cluster analyses were performed based on the EBVs for monthly test-day milk yield, peak yield, lactation persistency, and partial cumulative and 305-day yields. The heritability estimates for test-day milk yields ranged from 0.24 to 0.52. Cluster analysis identified animals in the population that belong to different groups according to milk production level and lactation persistency.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701281
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20150418
Formato: | text/html
Fonte: | Ciência Rural  v.46 n.7 2016
Fonte: | info:eu-repo/semantics/openAccess