No person shall lease, loan, trade or sell any swine 4 months of age and over for breeding purposes, or offer or receive the services of any male swine for breeding purposes, unless such swine are accompanied by an official brucellosis testing certificate showing that the swine have been tested by an accredited veterinarian within 60 days prior to the date of such transaction and found free of Brucella microorganisms; or the swine originated from a validated brucellosis-free herd or originated from a Validated Brucellosis-free Area. Such test shall be recognized for one change of ownership or premises only within the 60-day period. Except as otherwise provided, a negative test shall be required for each change of ownership or premises should a change of ownership or premises occur within 60 days from date of test.