Most countries now place restrictions on the importation of livestock. Often a quarantine is required before animals are released. Many countries have passed strict laws requiring that animals infected with certain highly contagious diseases be destroyed.

• 现在大多数国家对家畜进口采取限制措施。通常对家畜得事先经过检疫然后才予以放行。许多国家通过了严格的法律规定，受某些传染性疾病感染的动物必须予以消灭。