No partido or share contract, whereby livestock is delivered to be kept on shares for a period of time at the end of which they, or an equal or similar number, or any number thereof, are to be returned, whatever the specific terms of said contract may be, shall be valid, except as between the parties to said contract, unless such contract is filed or recorded in the office of the county clerk and recorder of deeds of the county wherein such livestock is to be kept.
C.R.S. § 35-54-106