Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/9798
Title: To have your steak and eat it: Genetic principal component analysis for beef cattle data
Contributor(s): Meyer, Karin  (author)
Publication Date: 2006
Handle Link: https://hdl.handle.net/1959.11/9798
Abstract: Quantitative genetic analyses usually deal with several, if not many, correlated traits or effects. Generally, the matrices of covariances among these effects are considered to be 'unstructured', i.e. for k traits we have k(k + 1)/2 distinct (co)variance components, and restrictions on estimates are imposed only to ensure that estimated matrices are positive semi-definite, i.e. do not have negative eigenvalues. In contrast, in other areas of statistics covariance matrices are often assumed to be structured. Parametric forms, such as compound symmetry or auto-regressive covariances (e.g. Jennrich and Schluchter 1986) are common assumptions for longitudinal or spatial data. Alternative parameterisations are based on the eigen-vectors and -values of the covariances matrices concerned. In particular, principal component (PC) analysis is widely utilised to summarise multivariate information and as a dimension reduction technique. So far, PC analyses (PCA) for genetic (or other random) effects have by and large been carried out in 2 steps, first obtaining full rank estimates of covariance matrices, and then performing an eigen-decomposition of the estimates. A better approach is to estimate the PCs directly and, at the same time, to restrict estimation to the most important components only (Kirkpatrick and Meyer 2004). This is readily accommodated within the usual linear, mixed model framework, requiring only a simple reparameterisation. This paper reviews direct estimation of PCs, and presents an application to an analysis of carcass traits of beef cattle.
Publication Type: Conference Publication
Conference Name: 8th World Congress on Genetics Applied to Livestock Production (WCGALP), Belo Horizonte, Brazil, 13th - 18th August, 2006
Conference Details: 8th World Congress on Genetics Applied to Livestock Production (WCGALP), Belo Horizonte, Brazil, 13th - 18th August, 2006
Source of Publication: Proceedings of the 8th World Congress on Genetics Applied to Livestock Production
Publisher: SBMA: Sociedade Brasileira de Melhoramento Animal [Brazilian Society of Animal Breeding]
Place of Publication: Brazil
Field of Research (FOR): 070201 Animal Breeding
HERDC Category Description: E2 Non-Refereed Scholarly Conference Publication
Other Links: http://www.cabdirect.org/abstracts/20063170057.html
Statistics to Oct 2018: Visitors: 38
Views: 38
Downloads: 0
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication

Files in This Item:
2 files
File Description SizeFormat 
Show full item record

Page view(s)

76
checked on May 3, 2019
Google Media

Google ScholarTM

Check


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.