Análises de agrupamento dos valores genéticos para produção de leite e persistência da lactação em bovinos da raça Guzerá
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Data
2016-07-01
Autores
da Cruz, Diego Augusto Campos
Savegnago, Rodrigo Pelicioni [UNESP]
Santana, Annaíza Braga Bignardi
Peixoto, Maria Gabriela Campolina Diniz
Bruneli, Frank Angelo Tomita
Faro, Lenira El
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Resumo
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.
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Breeding values, Lactation curve, Random regression
Como citar
Ciencia Rural, v. 46, n. 7, p. 1281-1288, 2016.