**Note: This section is aged rodents only.
The National Institute on Aging (NIA), part of the National Institutes of Health (NIH), maintains colonies of barrier-raised, Specific Pathogen-Free (SPF) rodents under contractual arrangement with commercial vendors, specifically for use in aging research. They are not available for use as a general source of adult animals for unrelated areas of research. Animals from the NIA aged rodent colonies are available to investigators at academic and non-profit research institutions under the terms described on the Eligibility Criteria page (link below). NIA rodents are provided through contracts with different contractors and information on the source of specific strains is provided on the Location of Colonies page.
Orders must be submitted through the online rodent ordering system (ROS) (http://arc.niapublications.org/acb/stores/1/). Due to the volume of business handled by the Order Desk, it is imperative that order forms be completely and correctly filled out (all fields completed). Incomplete order forms will be declined. We can only offer following week delivery for those oders for which completed order forms are received by the deadline of Tuesday noon, Eastern time.
Notice: change in source of F344 foundation stock
For all previous new F344 colony development, the NIA used foundation stock from the NIH Animal Genetic Resource. This facility was closed around 2004. Unfortunately, the F344 breeding stock from the NIH colony that was sent to the Rat Resource and Research Center would not breed, so this source of F344 stock is lost to us. The last stock we received from the NIH, for the caloric restriction colony, also bred poorly, suggesting an unknown genetic change in the NIH foundation stock. To ensure that we used foundation stock from a source that would likely be available for the long-term and for which the breeding patterns were consistent with F344’s history, we chose the Charles River-derived Fisher rat, F344-cdf. The description of the F344-cdf can be found at http://www.criver.com/en-US/ProdServ/ByType/ResModOver/ResMod/Pages/CDF.aspx .
Before making this decision, we had a genetic comparison done between the F344-nih (n = 18) and F344-cdf (n = 12). On a panel of 106 SNPs spanning all chromosomes, 100 of them were identical between the two colonies (94.3% identity):
While we cannot be sure how the change in the foundation stock will affect aging phenotypes, we feel that this is the best long-term solution to the loss of the NIH foundation stock. We are developing colonies of F344-nih (using breeding stock from our caloric restricted colony started in 2004) and F344-cdf in parallel so that investigators can compare the two substrains in their assays. Entries of the F344-nih began in the spring of 2013 and will be phased out by the end of 2014 so aged F344-nih will only be available until the end of 2016. Investigators wishing to make such comparisons should plan accordingly. In the beginning, F344-nih will be the default strain shipped unless the order states a specific request; by around 2015, it will switch to F344-cdf being the default strain.
The first cohorts of F344-cdf will be set aside for a lifespan study and the results of that study will be posted here as they become available. If anyone wants to share data comparing F344-cdf to F344-nih, we would be happy to post it here with appropriate citation. To submit comparison data, contact Dr. Nancy Nadon, email@example.com.