Univariate analysis of test day milk yields of British Holstein - Friesian heifers using Gibbs sampling

A - Papers appearing in refereed journals

Firat, M. Z., Theobald, C. M. and Thompson, R. 1997. Univariate analysis of test day milk yields of British Holstein - Friesian heifers using Gibbs sampling. Acta Agriculturae Scandinavica Section A-Animal Science. 47 (4), pp. 213-220.

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

Estimates of posterior distributions of genetic and phenotypic parameters and functions of them for individual test day milk yield are obtained for 28 873 British Holstein‐Friesian heifers, the progeny of 40 proven and 649 unproven sires, using restricted maximum likelihood (REML) and Gibbs sampling methods with a univariate sire model. Results from the two methods are then compared. It is found that the posterior expectations and REML estimates of the parameters are fairly similar. The marginal posterior expectation and REML estimate of heritability for lactation milk yield are 0.49 and 0.50, respectively. Heritability estimates for individual test day records range from 0.27 to 0.40, whilst the posterior expectations are between 0.28 and 0.42. Generally, heritabilities for test day records were lowest at the start and highest in the second half of the lactation. Gibbs sampling requires substantially more computing than REML estimation, but provides a more informative analysis.

Keywordsgenetic and phenotypic variance components; half‐sib sire model; heritability; test day records
Year of Publication1997
JournalActa Agriculturae Scandinavica Section A-Animal Science
Journal citation47 (4), pp. 213-220
Digital Object Identifier (DOI)doi:10.1080/09064709709362389
Open accessPublished as non-open access
Funder project or code207
Project: 141673
Output statusPublished
Publication process dates
Accepted28 Mar 1997
Copyright licensePublisher copyright
PublisherTaylor & Francis As

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