Families who want to drink fresh raw milk without buying their own dairy herds are backing a bill to sanction "cow sharing." The practice lets people buy into a herd and share the resulting milk, cheese and other dairy products. Proponents say raw milk is more nutritious and delicious. "Right now, shared ownership isn't illegal, but it is not recognized," said John-Mark Hack of Marskbury Farm Market in Lancaster, who testified in favor of the bill before the Senate Agriculture Committee last month.