Combine all the ingredients in a stockpot or large saucepan. Add 9 cups of water and bring to a boil over high heat. Lower the heat and simmer for 2 hours, skimming occasionally. Strain the broth into a large bowl. Skim the fat from the surface of the broth before using.
The broth can be refrigerated, covered, for up to 3 days or frozen for up to 1 month.