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Merino Sire Evaluation is a service provided co-operatively by the University of New South Wales and New South Wales Agriculture and is a means whereby rams from a range of studs can be progeny tested at a central location. Two Riverina test sites at Hay and Deniliquin are currently administered by the University with a third site at Dubbo being managed privately but linked to the University schemes via common reference rams. Fine wool schemes are also being run in the New England region of N.S.W and at Hamilton in Victoria. The schemes are run on a fee for service basis with ram breeders currently paying $2000 per ram entered, which covers the cost of artificial insemination, wool testing, classing, data collection and analysis, report generation and management. The protocols and management of the schemes have been described previously by Roberts et al. (1991). Due to costs, traits currently measured are restricted to the most economically important ones such as clean fleece weight and fibre diameter (Cottle et al. 1991). Research projects run by the University have resulted in fibre diameter variability, lamb birth coat score and colour also being measured. Progeny are assessed for visual characteristics, which describe the conformation, wool quality, fleece quantity and pigmented markings of the sheep as well as classing performance (see Casey 1991). A major criticism of central test sire evaluation is the small number of sires that may be tested. Currently it is only practical to evaluate 12-16 sires per test station per year. For this reason it is important that data from different sites and years be combined to allow comparison of a larger number of sires. The development and availability of software such as SIREBLUP (Gilmour 1990) has allowed across site and year comparisons to be made using multi-trait Best Linear Unbiased Prediction (BLUP) methods. Despite a number of technical problems with its use in sire evaluation (Russell and Cottle 1992), multi-trait BLUP has become the standard method of analysis of objective data from sire evaluation programs. This paper presents sire evaluation results combined across five years (1987-1991) and three sites (Hay, Deniliquin and Dubbo). These results greatly enhance the value of the programs, and provide an accurate assessment of 92 sires from over 3,000 progeny. Previously published comparisons have been limited to 12 or 14 sires. A related paper (Atkins et al. 1993) presents subjective results on culling performance, conformation, wool quality and fleece quantity pooled across years and sites. Both papers need to be considered to maximise the information from the programs.