Mouse strain are referenced in the taxonomy ontology but without real identifiers (HBP_TAX is used and it maps to http://www.hbp.FIXME.org/hbp_taxonomy_ontology).
How the referenced mouse strain are related to MGI database. Looks like yes according to what is discussed here (for rat though).
I made a search and get:
http://www.informatics.jax.org/downloads/reports/MGI_Strain.rpt
Is this relevant or do we have mouse strain in NIFSTD