In the certification of selenium-enriched products in livestock and aquaculture categories, the primary method involves animals consuming selenium-enriched feed to absorb selenium elements, ensuring that meat products or eggs meet the standard range for selenium content. The feed may consist of natural selenium-rich plants or include additives like selenized yeast. The selenium-enriched standard is achieved through animal digestion and absorption.

Certification scope includes: live animals such as pigs, cattle, sheep, fish, and poultry eggs; animal products like meat.

Requirements for selenium-enriched product certification:

1. Breeding enterprises must provide: business license, animal epidemic prevention qualification certificate (for livestock), aquaculture license (for aquaculture), and documentation proving the source of selenium-enriched feed.

2. Processing enterprises must provide: business license, industry permit, and documentation proving the source of selenium-enriched raw materials.

3. Other materials required to meet certification standards.