By Lori EhdeThe heat wave lifted this week just in time for the 2006 Rock County Fair, which officially starts today.Highlights at the fairgrounds today include the Rock Nobles Cattlemen’s beef feed at 5:30 p.m. and the Rock County Amateur Talent Contest in the grandstand at 7 p.m.According to one of the talent show organizers Jane Wildung, a strong showing of entries — more than 20 — had signed up by the July 28 deadline.Highlights on Friday’s fair schedule include free water nitrate testing by the Rock County Land Management Office starting at 2 p.m. and the Senior Citizens Day program — featuring Rock County’s Outstanding Senior Citizens and entertainment by Country Grass — also at 2 p.m.The Rock County Pork Producers will start their pork feed at 5:30 p.m. and the Ranch Rodeo will begin in the grand stand at 6 p.m. (see story in the Star Herald sports pages).The grandstand finale Saturday night features the Bio Fuels Enduro Race starting at 7 p.m. (see writeup in the Star Herald sports pages).Thursday, Friday and Saturday features daily livestock shows, with the parade of champions at 6 p.m., exhibits in the commercial buildings and the Floral Hall and Mad Jax on the Midway from 6 p.m. to midnight Thursday, and from 1 p.m. to midnight Friday and Saturday.