AUSTIN -- For the week ending July 30, feeder cattle prices at Texas auctions were mostly steady to $8 lower per hundredweight, though higher prices were also noted at a few locations. Unchanged fed cattle prices, volatile grain markets and continued large numbers of calves and cull cows coming to auctions were primary factors. Fed cattle prices were unchanged with wholesale beef prices lower on Choice and slightly higher on Select-grade. Cotton cash prices were unchanged as continued weak exports offset the prospects for a smaller 2011 crop. Corn prices were lower as storms brought rain and cooler temperatures to the Corn Belt. Wheat and grain sorghum followed corn lower. . . .