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Employing Informetric analysis, the study investigated the features, types of documents, subjects spread and challenges affecting the growth and development of Ahmadu Bello University, Zaria Institutional Digital Repositories (ABU-IDR). The findings of the study indicated that the IDR has diverse features, deploying DSpace, Dublin core metadata elements and Open Archive Initiative – Metadata Harvesting Protocol (OAI-PMH) to make the repository robust and interoperable. As reported by earlier studies, ABU-IDR is also found to be dominated by theses and dissertations with 9,857(95.82) documents. Finding on subjects spread of theses and dissertations illustrated that Faculties of Sciences and Education have the largest subject coverage with 1979 (20.1%) and 1702 (17.3%) respectively. With diverse features and deploying DSpace, OAI-PMH and its interoperability, the study concluded that ABU-IDR has gained considerable traction in recent years. However, the IDR can be made more effective and efficient by creating institutional repository policy that will take care of copyright, deposition right, diversification of contents and advocacy which are the major challenges hampering the growth and development of the IDR.