A bipartisan group of lawmakers will introduce legislation Thursday to prevent the Department of Agriculture from continuing deadly experiments on kittens. "The USDA's decision to slaughter kittens after they are used in research is an archaic practice and horrific treatment, and we need to end it," Sen. Jeff Merkley, D-Ore., the Senate bill's lead sponsor, said in a statement to NBC News. The agency has been breeding kittens in Beltsville, Maryland, and infecting them with a parasite that can cause toxoplasmosis, a food-borne illness. Scientists harvest the parasites from their stool for two to three weeks, and then euthanize and...