Section 172A.9 - Payment for livestock1. Each dealer, or broker purchasing livestock, before the close of the next business day following either the purchase of livestock or the determination of the amount of the purchase price, whichever is later, shall transmit or deliver to the seller or the seller's duly authorized agent the full amount of the purchase price. If livestock is bought on a yield or grade and yield basis, a dealer or broker shall upon the express request in writing of the seller, transmit or deliver to the seller or the seller's duly authorized agent before the close of the next business day following such purchase or delivery, whichever is later, up to eighty percent of the estimated purchase price, and pay the remaining balance on the next business day following the determination of the purchase price.2. Payment to the seller shall be made by cash, check, or wire transfer of funds. If payment to the seller is by check, the check shall be drawn on a bank located in this state or on a bank located in an adjacent state and in the nearest city to Iowa in which a check processing center of a federal reserve bank district is located. For the purpose of this subsection, "wire transfer" means any telephonic, telegraphic, electronic, or similar communication between the bank of the purchaser and the bank of the seller which results in the transfer of funds or credits of the purchaser to an account of the seller.3. Provisions of this section may be modified by an agreement signed by both the buyer and the seller or their duly authorized agents at the time of the sale. However, such an agreement shall not be a condition of sale unless expressly requested by the seller.4. Failure to comply with this section shall be a violation of this chapter.