Here is a good article. Hes got articles at T-mag and dragondoor.
http://www.dragondoor.com/articler/mode3/334/
"If you want to hold muscle you will need to maintain the volume and intensity you used to build it. You may need to add sets and drop reps, and extend rest periods. 5x5 done crisply after 6-8 meals in a day may need to be 3x8 sets dragged out a bit with longer rest periods in the cutting cycle of only 5 meals. "