In a 7-qt/6.5-L slow cooker, combine all the ingredients. Cover with 12 cups [2.8 L] of cold water. Cover the cooker and cook on low heat for 8 to 9 hours.
Strain the broth through a fine-mesh sieve into a large bowl. Refrigerate the broth, uncovered, until cool. Spoon off and discard the hard fat that has settled on the top of the broth. Store in airtight cont