By Julie Ingwersen CHICAGO (Reuters) – Bovine avatars with funny hats in an app are being corralled into helping to teach young people in the United States about agricultural markets and risk. The CME Group futures exchange launched the app, called “Risk Ranch,” for tablets and smartphones as an electronic version of a board game called “Commodity Carnival” – first bought to state fairs in 2013 by CME and the 4-H youth organization. “We heard from educators who asked us, ‘How can I get this in my classroom?'” said Laurie Bischel, CME’s executive director of corporate marketing and communications.