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Live ScienceHeritage Livestock are Vanishing Across the United States (Photos) - LiveScienceLive ScienceFrom fainting goats to ancient white park cows, U.S. livestock used to be incredibly diverse. Now, with only a few breeds dominating American farms, reserachers are using IVF and cryopreservation to save, and restore, heritage animals. Read more about ...and more »