Multivariate analysis of test day milk yields of British Holstein- Freisian heifers using Gibbs sampling

A - Papers appearing in refereed journals

Firat, M. Z., Theobald, C. M. and Thompson, R. 1997. Multivariate analysis of test day milk yields of British Holstein- Freisian heifers using Gibbs sampling. Acta Agriculturae Scandinavica Section A-Animal Science. 47 (4), pp. 221-229.

AuthorsFirat, M. Z., Theobald, C. M. and Thompson, R.
Abstract

Estimates and posterior distributions of genetic and phenotypic variance matrices for test day milk records are obtained for 23 873 British Holstein‐Friesian heifers, the progeny of 40 proven and 649 unproven sires, using restricted maximum likelihood (REML) and Gibbs sampling methods with two different prior specifications in a multivariate sire model. Results from the two methods are then compared. The REML estimates and posterior expectations of heritability and individual test day records range from 0.28 to 0.42. Generally, heritabilities for test day records are lowest at the start and highest in the second half of the lactation. Estimates of genetic correlations between test day milk yields range from 0.59 to 0.99, whilst those of phenotypic correlations are between 0.30 and 0.76, the correlations being highest for adjacent tests. Bayesian inferences are more informative, but require much more computer time.

Keywordsgenetic and phenotypic variance matrices; heritability; multivariate half‐sib sire model; test day milk records
Year of Publication1997
JournalActa Agriculturae Scandinavica Section A-Animal Science
Journal citation47 (4), pp. 221-229
Digital Object Identifier (DOI)doi:10.1080/09064709709362390
Open accessPublished as non-open access
Funder project or code207
445
Project: 141673
Publication dates
Online01 Oct 2008
Publication process dates
Accepted28 Mar 1997
Copyright licensePublisher copyright
ISSN0906-4702
PublisherTaylor & Francis As

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