VSN International / Software / ASReml


Analysing data with all new ASReml 4

ASReml 4, the outstanding data analysis software designed for fitting linear mixed models is now available for download. Already widely used by scientists and researchers in the biosciences the new procedures and functionality added at version 4 will further extend ASReml’s ability to analyse large datasets and complex statistical models.

Since its original launch ASReml has enabled scientists to investigate and understand relevant factors in breeding and genetics leading to for example, the identification of superior grain varieties for farmers in Australia (based on the National Variety Trials system) and generating herd heritability estimates (based on research at the Pennsylvania State University). ASReml is vital for researchers with very large datasets, who may need to apply complex statistical models. Unlike other software systems ASReml can easily and efficiently handle large datasets. ASReml is unique in that it uses the Average Information (AI) algorithm for the fitting of linear mixed models and it is optimised for working with genetics data and hence performs considerably faster than other generic data analysis software. The superior range of variance models are specifically suited to the analysis of data arising from genetic applications in animal and plants, so ASReml is chosen by researchers and scientists who need these specific analysis tools provided in ASReml. It also has an in-built link with R for scientists and researchers who prefer to use the R programming environment rather than more generic windows based systems. It was and continues to be developed by researchers working in bioscience, so the statistics are sound, valid and most importantly relevant to the needs of bioscientists.

Users are supported by VSNi (if they have a support contract), a range of tutorials and user guides and by an active user community through the ASReml Forum. For more details on ASReml, see the new features page.

Free Upgrade

Users with current support contract or annual license are automatically entitled to this upgrade. The license software has been updated to the latest version but existing license keys should continue to work with ASReml 4, so long as the Support Version code is 1503 or higher. The License Guide explains how you can check your key and what changes might be needed, if any.


ASReml 4 is supported on the same platforms as ASReml 3. The download procedure is the same as before.


ASReml 4 downloads have been updated for Linux – please read the notes on the downloads page before installing.