(bankruptcy trustee seeks to recover from the defendant over $836,000 as a preferential transfer relating to cattle sales; defendant claims that transfers to defendant were transfers of funds held in bailment for defendant as proceeds of cattle that defendant owned but were fed at a feedlot that the debtor operated and that debtor sold the cattle on defendant's behalf to third parties; the court determined that the proceeds that were contained in the debtor's account were not traceable to the defendant because they were commingled in that account with other funds and were spent for debts other than those owed to the defendant in the weeks immediately preceding the bankruptcy filing; court also determined that the defendant was merely one of multiple creditors that sought payment from a limited asset source and that imposing a constructive trust would be unfair to other creditors; bankruptcy trustee satisfied the requirements for establishing a preferential transfer under 11 U.S.C. Sec. 547).