L-色氨酸 — additive cross-jurisdiction identity
Derived crosswalk of how one feed additive is named and authorised across three jurisdictions. No claim of regulatory equivalence is made — pairings are anchored on the substance identity, and the verdict states where the definitions actually diverge.
- Substance anchor: L-色氨酸
- Verdict:
closest_with_differences
Per-jurisdiction entry
- 🇨🇳 CN — 公告2045
L-色氨酸: L-色氨酸 is listed in 表一 饲料添加剂品种目录 (category 氨基酸、氨基酸盐及其类似物 for amino acids / 矿物元素及其络（螯）合物 for chelates / 维生素及类维生素 for vitamins), scope 养殖动物 (all livestock and poultry). _(src: CN 公告2045)_ - 🇪🇺 EU — Reg 1831/2003
(EU) 2017/873: Commission Implementing Regulation (EU) 2017/873 of 22 May 2017 concerning the authorisation of L-tryptophan produced by Escherichia coli as a feed additive for all animal species (Text with EEA relevance _(src: EU (EU) 2017/873)_ - 🇺🇸 AAFCO (US) — Ch.6: No stand-alone AAFCO OP 2024 Ch.6 entry for this substance. AAFCO defines amino acids / vitamins only where a corresponding feed ingredient (often a fermentation product) is listed; where absent, the cell is an honest gap, not a claim of non-existence. _(src: AAFCO OP 2024 Ch.6 — gap)_
Crosswalk verdict
CN 公告2045 and EU 2017/873 both authorise L-tryptophan for all animal species. AAFCO OP 2024 Ch.6 has no stand-alone L-tryptophan entry. Verdict: CN↔EU equivalent; AAFCO gap.
Sources
- CN: 农业部公告第2045号 《饲料添加剂品种目录》 (first-hand; fujian compile txt, intra-cell line wraps normalised for verbatim quotation)
- EU: https://eur-lex.europa.eu/eli/reg_impl/2017/873/oj/eng (first-hand EUR-Lex, fetched 2026-08-07)
- AAFCO: OP 2024 Ch.6 — no matching stand-alone entry (honest gap)