When infection of tuberculosis is found in any herd of cattle or goats, the remaining animals in such herd shall be quarantined until such herd has passed three successive negative tests, at least sixty days to elapse between each two tests. No animals shall be removed from such herd while under quarantine, except under a written permit issued to the owner of the herd by the Commissioner of Agriculture or his agents to move directly from the quarantined premises to immediate slaughter. Such permit shall accompany such animals from the quarantined premises to the point where slaughter is to be effected. The owner shall deliver such permit to any person purchasing such animals, and such person shall exercise all reasonable diligence in determining that such permit is received by him and is valid, and that such permit shall accompany such animals to slaughter.