World Dairy Expo Thanks Calf-Tel for, "Generous support of World Dairy Expo 2010". Calf-Tel has been a sponsor of World Dairy Expo three years running. This year Calf-Tel took part in a 3 Star Sponsorship Package, which "helps make Expo a special event that attracts over 65,000 attendees to Madison each year." The 2010 World Dairy Expo attracted 65,136 attendees, which included 2,572 international visitors from 87 countries. This year also featured 2,411 dairy cattle on the show grounds.