The thefts are being blamed on high beef prices, which have made livestock more valuable - and it's not just cattle.
Recently, 6000 lambs were stolen from a farm in Texas and 1000 pigs were taken from farms in Iowa and Minnesota.
The thieves have developed sophisticated techniques, pulling up trailers in the middle of the night, knowing exactly how to coax the animals inside and even replacing pasture fences that they've cut to get to the animals.
One farmer stumbled across one of his branded cows on another man's property. Officials later discovered 36 cows and 31 calves on the property, belonging to nine different people, all worth $68,000 (NZ $84200).