9 C.F.R. § 91.7
(a) All livestock intended for export by air or sea must receive a visual health inspection from an APHIS veterinarian within 48 hours prior to embarkation, unless the importing country specifies otherwise. The purpose of the inspection is to determine whether the livestock are sound, healthy, and fit to travel. The APHIS veterinarian will reject for export any livestock that he or she finds unfit to travel. The owner of the animals or the owner's agent must make arrangements for any livestock found unfit to travel. Livestock that are unfit to travel include, but are not limited to:
(c) Conditions for approval of pre-export inspection at an export isolation facility.