Now researchers think that they have found the perfect spider-silk factory where few would look: the udders of dairy goats. On farms in the Montreal suburbs and in upstate New york, researchers are breeding hundreds of goats genetically engineered to produce milk rich with spider silk proteins that can be spun into fiber. Executives at Nexia Biotechnologies Inc., the Canadian company that raises the goats, envision a burgeoning market for its spider silk fibre, which it calls Biosteel.