The Tennessee Department of Agriculture is warning residents about potential online scams involving cattle purchases online.State officials posted to their Facebook page about a Coffee County farmer who spoke to an alleged scammer claiming to be in Arkansas about purchasing livestock on a site called ‘Cattle Exchange.’The farmer saw photos/video of the cattle and settled on a price. The ‘seller’ requested a $15,000 deposit, which was sent via wire transfer, with the remaining fee to be paid upon delivery.Instead the seller demanded the money in full before the delivery.