510 ILCS 30/6.7

Bison, except steers, spayed heifers, or calves under 6 months of age, may be imported into Illinois if consigned direct for immediate slaughter to an approved slaughtering establishment and accompanied by a consignment certificate, or if accompanied by an official health certificate indicating the bison:

(a) Originated from a certified brucellosis-free herd; or

(b) Are official female brucellosis vaccinates under 24 months of age; or

(c) Were negative to an official brucellosis test within 30 days prior to importation.

Bison steers, spayed heifers, or calves under 6 months of age may enter Illinois when accompanied by an official health certificate, or consigned for immediate slaughter to an approved slaughtering establishment accompanied by a consignment certificate.