Amgen is facing renewed criticism from animal-rights campaigners over its business relationship with a breeder that supplies beagles and other animals for laboratory research. The company continues to work with a supplier that the USDA has repeatedly cited under the Animal Welfare Act, demonstrators said at an August 3 protest near Amgen's Thousand Oaks campus. What happened? Protesters with Direct Action Everywhere, or DxE, gathered outside the…