Market reports from the weekly Fed Cattle Exchange sale on Dec. 14: 7,753 total head offered, including 1 lot each of Longhorn cross, Holstein and Mexican cattle. 3,249 head sold with a weighted average price of $110.47, a touch more than last week’s $110.29 weighted average. South Dakota had lowest trades at $108, with Kansas and Texas tying for highest at $111.50.  To see the complete sale results, click here or visit fedcattleexchange.com…