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Article << Previous     |     Next >>   Contents Vol 52(11)

Modelling genetic covariance structure across ages of mean fibre diameter in sheep using multivariate and random regression analysis

M. Asadi Fozi A B E, J. H. J. Van der Werf B D and A. A. Swan C

A Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.
B School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
C Animal Genetics and Breeding Unit (AGBU1), University of New England, Armidale, NSW 2351, Australia.
D Cooperative Research Centre for Sheep Industry Innovation, Armidale, NSW 2351, Australia.
E Corresponding author. Email: masadifo@une.edu.au

Animal Production Science 52(11) 1019-1026 http://dx.doi.org/10.1071/AN12139
Submitted: 20 April 2012  Accepted: 23 May 2012   Published: 8 August 2012


 
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Abstract

Mean fibre diameter measurements from yearling to 5-year-old Australian fine- and medium-wool Merino sheep were analysed using several multivariate models that varied in covariance structure. A pre-structured multivariate model was found to be the most parsimonious model in comparison with the other models fitted such as banded, autoregressive and random regression. In the preferred model, the ages of mean fibre diameter for fine-wool data were genetically partitioned into yearling, 2 years, 3 years and later ages and for medium-wool data into hogget, 2 years and later ages. The estimates of genetic correlations between mean fibre diameter measured at different ages for medium-wool sheep were higher (0.89–1.00) than those for fine-wool Merino (0.75–1.00).



References

Albuquerque LG, Meyer K (2001) Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle. Journal of Animal Science 79, 2776–2789.

Asadi Fozi M, Van der Werf JHJ, Swan AA (2005) The importance of accounting for maternal genetic effects in Australian fine-wool merino breeding. Australian Journal of Agricultural Research 56, 789–796.
CrossRef |

Atkins KD (1990) Incorporating parameters for lifetime productivity into breeding objectives for sheep. Proceedings Fourth World Congress Applied Production 15, 17–26.

Brash LD, Taylor PJ, Gilmour AR (1997) Estimates of genetic parameters and environmental effects for production traits in young Merino rams. Proceedings of the Association for the Advancement of Animal Breeding and Genetics. 12, 529–533.

Coelli KA, Gilmour AR, Atkins KD (1998) Comparison of genetic covariance models for annual measurements of fleece weight and fibre diameter. Proceedings Sixth World Congress Applied Production 24, 31–34.

Gilmour AR, Gogel BJ, Cullis BR, Welham SJ, Thompson R (2006) ‘ASReml user guide. Release 2.0.’ (VSN International Ltd.: Hemel Hempstead, UK)

Hickson JD, Kinghorn BP, Swan AA, Piper LR (1994) The relationship between hogget and adult production traits in Merino sheep. Proceedings Fifth World Congress Applied Production 18, 139–142.

Huisman AE, Brown DJ (2009) Genetic parameters for body weight, wool, and disease resistance and reproduction traits in Merino sheep. 4. Genetic relationships between and within wool traits. Animal Production Science 49, 289–296.
CrossRef |

Mortimer SI, Atkins KD (1989) Genetic evaluation of production traits between and within flocks of Merino sheep. I Hogget fleece weights, body weight and wool quality. Australian Journal of Agricultural Research 40, 433–443.
CrossRef |

Mortimer SI, Atkins KD (2003) Genetic parameters for clean fleece weight and fibre diameter in young Merino sheep. Proceedings of the Association for the Advancement of Animal Breeding and Genetics. 15, 143–146.

Nobre PRC, Misztal I, Tsuruta S, Bertrand JK, Silva LOC, Lopes PS (2003) Analysis of growth curves of Nellore cattle by multiple-trait and random regression models. Journal of Animal Science 81, 918–926.

Swan AA, Purvis IW, Piper LR (2008) Genetic parameters for yearling wool production, wool quality and bodyweight traits in fine wool Merino sheep. Australian Journal of Experimental Agriculture 48, 1168–1176.
CrossRef |

Wolfinger RD (1993) Covariance structure in general mixed models. Communications in Statistics. 22B, 1079–1106.


   
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