Per feline-nutrition (dot) org, there should be 1.5tsp per 5 to 6 lbs of raw meat/bones/organs. This is the recipe I use since I buy 80/10/10 grinds.10 lbs of meat would need about 1 3/4 tsp of Morton's Lite salt to just meet the AAFCO minimum recommendation for iodine. That would provide about 0.42 mg of iodine.
Easy Raw Diet Feeding for the Busy Person