DAIRY BRIEFS: Despite some thoughts of moving a new plant south of Syracuse, N.Y.,Great Lakes Cheese, Hiram, Ohio, will finish a $67 million facility in Adams, N.Y., near an existing operation there. Syracuse, N.Y.'sNews 10 Nowtelevision station said Great Lakes now expects by September to complete construction on the new 142,000-square-foot site Officials said the new plant will produce 870 million pounds of cheese a year. . . .O-AT-KA Milk Products Cooperative Inc., Batavia, N.Y., said it is celebrating its 50th anniversary. O-AT-KA processes more than 600 million pounds of milk per year and is a leading processor of evaporated milk, butter and bulk fluids. Officials say the cooperative also has branched into infant formula, dietary nutritional beverages, protein and energy drinks as well as ready-to-drink coffees, teas and dairy-based liqueurs.