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PSA'S POULTRY SCIENCE RANKS AS THE MOST INFLUENTIAL JOURNAL AMONG POULTRY RESEARCHERS AND 5^TH OUT OF 43 JOURNALS IN RELATED FIELDS, AS MEASURED BY NEW 'IMPACT FACTOR' DATA

The Journal of Applied Poultry Research, also a PSA Publication, Jumps 9 Spots to 24^th Place

Both PSA Journals Now Available in an Easier-to-Access and More Flexible Online Environment

SAVOY, IL (September 28, 2006) – Poultry Science, a research journal published by The Poultry Science Association (PSA), is the journal of choice among poultry researchers, according to a metric based on new data on citations to recent articles. According to the same metric, Poultry Science also ranks 5^th out of 43 research journals in agriculture, dairy, and animal science, PSA announced today.

According to newly released data in Thomson Scientific's Journal Citation Reports^® on citations to academic journals, Poultry Science and the Journal of Applied Poultry Research (JAPR), also a PSA publication, made major gains as measured by 'impact factor' in 2005 over their rankings during the previous year. Poultry Science moved up six places, from 11^th in 2004 to its 5^th-place ranking in 2005; JAPR gained 9 places year-over-year, from a ranking of 33^rd in 2004 to 24^th in 2005.

A journal's 'impact factor' is a measure of how frequently recent articles in the publication are cited and is indicative of the usefulness of recent articles and of current activity levels in a given area of research.

The new citation data also demonstrate that many earlier articles published in Poultry Science continue to serve the interests of present-day researchers. Of the 43 journals in the agriculture, dairy, and animal sciences category, the journal was one of only eight publications whose articles had a long 'cited half-life' of more than 10 years, meaning that half of the citations to the journal were to articles published more than 10 years ago. JAPR's 2005 cited half-life was 6.2 years.

"These rankings confirm that of all of the poultry-focused journals available, most researchers are turning to Poultry Science and JAPR when it comes to publishing their most important work. The high ranking of Poultry Science in particular, which is now in its 85th year, reflects the high quality and enduring value of its content," said Dr. Andrew Giesen, PSA's president.

Published monthly, papers in Poultry Science focus on findings from basic (pure) scientific research, including work on: breeding and genetics; production, modeling, and education; environment, well-being and behavior; immunology, health, and disease; molecular, cellular, and developmental biology; metabolism and nutrition; physiology, endocrinology, and reproduction; and processing, products, and food safety. Poultry Science was founded in 1914 as the Proceedings of Poultry Practitioners; it was first published under its current name in 1921.

The Journal of Applied Poultry Research is published quarterly. Its content focuses primarily on scientific approaches to practical problem solving and near-term applications. JAPR was first published in 1991.

Both journals are available in print and online.

New Online Hosting Environment – More Choices, Easier Access for Subscribers

PSA also announced that, beginning in September 2006, both of its journals will be moving to a richer online hosting environment at High Wire Press. High Wire Press is an online hosting platform affiliated with Stanford University and is home to most of the top scientific journals that are available online. The new platform will provide access to articles in both html and PDF formats; it will also simplify subscription management by requiring only a single password for a subscriber to access all of his or her online subscriptions.

Determination of 'Impact Factor' The 'impact factor' for a journal in a given year is defined as the ratio of the number of cites to articles published over the previous two years in that journal divided by the total number of articles published in that journal over the previous two years. For example, there were 553 articles published in Poultry Science from 2003 – 2004, and 966 citations of these articles in 2005; hence, the impact factor for Poultry Science in 2005 is 1.747 (=966/553).

About PSA

The Poultry Science Association (PSA) is a global scientific society dedicated to the discovery and dissemination of knowledge generated by poultry research – knowledge that enhances human and animal health and well-being and provides for the ethical, sustainable, and economical production of food. Founded in 1908, PSA has a global membership of about 3,500. For more information, go to www.poultryscience.org.