Any lot of commercial feed which is seized and held pursuant to this chapter, unless previously analyzed by the director, shall be sampled and promptly analyzed within a reasonable period of time, as set by the director by regulation, after the seizure for the purpose of determining if such commercial feed is, in fact, in violation of the provisions of this chapter or the regulations adopted pursuant to it. The person having control of the feed shall be immediately notified by the director as to whether or not the sample was found to be in violation. If the results of analysis are not made known to the person having control of the feed within the period of time specified by the director by regulation, the lot of commercial feed being held shall be immediately released and the hold order or tag removed.