There is a murine protocol (Chapter 3: "Isolation of murine adipose-derived stem cells" by Yu et al.) in Methods in Molecular Biology 702. Adipose-Derived Stem Cells: Methods and Protocols by Gimble and Bunnell (2011).
I use the protocol in Chapter 1 which is "Isolation and culture of rhesus adipose-derived stem cells" for harvesting/growing rat stem cells from adipose tissue. Works well for me.