Document Detail

Genetic correlations among and between wool, growth and reproduction traits in Merino sheep.
MedLine Citation:
PMID:  17488356     Owner:  NLM     Status:  MEDLINE    
Data from seven research resource flocks across Australia were combined to provide accurate estimates of genetic correlations among production traits in Merino sheep. The flocks represented contemporary Australian Merino fine, medium and broad wool strains over the past 30 years. Over 110,000 records were available for analysis for each of the major wool traits, and 50,000 records for reproduction and growth traits with over 2700 sires and 25,000 dams. Individual models developed from the single trait analyses were extended to the various combinations of two-trait models to obtain genetic correlations among six wool traits [clean fleece weight (CFW), greasy fleece weight, fibre diameter (FD), yield, coefficient of variation of fibre diameter and standard deviation of fibre diameter], four growth traits [birth weight, weaning weight, yearling weight (YWT), and hogget weight] and four reproduction traits [fertility, litter size, lambs born per ewe joined, lambs weaned per ewe joined (LW/EJ)]. This study has provided for the first time a comprehensive matrix of genetic correlations among these 14 wool, growth and reproduction traits. The large size of the data set has also provided estimates with very low standard errors. A moderate positive genetic correlation was observed between CFW and FD (0.29 +/- 0.02). YWT was positively correlated with CFW (0.23 +/- 0.04), FD (0.17 +/- 0.04) and LWEJ (0.58 +/- 0.06), while LW/EJ was negatively correlated with CFW (-0.26 +/- 0.05) and positively correlated with FD (0.06 +/- 0.04) and LS (0.68 +/- 0.04). These genetic correlations, together with the estimates of heritability and other parameters provide the basis for more accurate prediction of outcomes in complex sheep-breeding programmes designed to improve several traits.
E Safari; N M Fogarty; A R Gilmour; K D Atkins; S I Mortimer; A A Swan; F D Brien; J C Greeff; J H J van der Werf
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie     Volume:  124     ISSN:  0931-2668     ISO Abbreviation:  J. Anim. Breed. Genet.     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-05-09     Completed Date:  2007-11-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100955807     Medline TA:  J Anim Breed Genet     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  65-72     Citation Subset:  IM    
The Australian Sheep Industry Cooperative Research Centre, NSW Department of Primary Industries, Orange Agricultural Institute, Orange, NSW, Australia.
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MeSH Terms
Body Weights and Measures
Breeding / statistics & numerical data*
Fertility / physiology
Litter Size
Models, Genetic
Reproduction / physiology*
Sheep / genetics*,  growth & development*,  physiology
Wool / anatomy & histology,  growth & development*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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