Title

Genetic characterization of the lactation curve from a random regression model in Colombian Holstein cattle

Document Type

Article

Publication Date

5-1-2016

Publication Title

Livestock Research for Rural Development

Abstract

The aim of this study was to estimate the variance components for different measures of milk production in the Holstein population of Colombia, calculated from a random regression model (RRM). Breeding values (BV) for persistence, total milk production at 305 days, milk production peak, production in the first, second and last third of lactation were also estimated. The data from 6675 Holstein cows with 60513 production records and a genealogy of 17062 animals used were. RRM with Legendre polynomials of order 3 for additive effects, order 6 for the permanent environmental effects and six intervals for residual genetic variance effects were used. The heritabilities for all traits were medium and showed high correlations between them, unlike the persistence trait that presented a medium to low correlation with the other traits. The results confirm that the selection in one of the production traits, results in indirect improvement of others ones. However, it should be noted that in the case of persistence and production in the last stage of lactation, it would be more appropriate to do direct selection.

Volume

28

Issue

5

ISSN

01213784

Identifier

SCOPUS_ID:84964800349

Documento original

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