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- Title
Cluster analysis of breeding values for milk yield and lactation persistency in Guzerá cattle.
- Authors
Campos da Cruz, Diego Augusto; Pelicioni Savegnago, Rodrigo; Bignardi Santana, Annaíza Braga; Diniz Peixoto, Maria Gabriela Campolina; Tomita Bruneli, Frank Angelo; El Faro, Lenira
- 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.
- Subjects
BREEDING; LACTATION; REGRESSION analysis; CLUSTER analysis (Statistics); MILK yield
- Publication
Ciência Rural, 2016, Vol 46, Issue 7, p1281
- ISSN
0103-8478
- Publication type
Article
- DOI
10.1590/0103-8478cr20150418