The Cooperative Dairy DNA Repository (CDDR) is an extension of the Dairy Bull DNA Repository (DBDR) started at the University of Illinois in 1993 to conduct genetic research for recessive and genomic research. CDDR contributors are A.I. organizations that provide semen to the CDDR for all their bulls as they enter into progeny testing each year, or that are in active commercial service and which have signed a Memorandum of Understanding with the USDA identifying them as such. Each Contributor must submit 10 straws from each bull they progeny test. Current contributors are ABS Global, Accelerated Genetics, Alta Genetics, Genex/CRI, Select Sires, Semex and Taurus Service. At the start of the genomic project, several sires were added to the collection to improve the robustness of the research.
The purpose of the CDDR is to 1) collect dairy semen, DNA, or other tissue samples from all bulls entering progeny testing, maintain an ongoing inventory of these samples, and distribute samples to research laboratories for the purpose of genomic research in dairy cattle, 2) provide a single entity for collection, storage, and distribution for blood, hair, other tissues or DNA from dairy cattle, and 3) collect all data on CDDR animals and other relevant animals and distribute that information to the contributors and data analysis collaborators, according to the terms of the Memoranda of Understanding between the USDA and semen Contributors. The primary objective of this effort is to characterize the cow genome; likely outcomes include: identification of genetic markers, quantitative trait loci (QTL) and any other polymorphisms associated with genetic variation for traits of interest to the dairy cattle industry, and whenever relevant integration of this genomic information into national genetic evaluations.
Currently more than 31,000 bulls are in the CDDR inventory compared to 18,000 bulls three years ago.