L-半胱氨酸 — additive cross-jurisdiction identity

Derived crosswalk of how one feed additive is named and authorised across 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-半胱氨酸 (L-Cysteine)
Verdict: closest_with_differences

Per-jurisdiction entry

🇨🇳 CN — 公告2045 L-半胱氨酸: L-半胱氨酸 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); scope 养殖动物. _(src: CN 公告2045)_
🇪🇺 EU — Feed Additives Register 2b92457: L-cysteine — functional category 2 b. Authorised in the EU feed additives register (first-hand-derived parse of the EU Food & Feed Information Portal register). Cross-jurisdiction note: this EU authorisation is quoted from the register and is not asserted to be equivalent to the CN 公告 2045 / FDA EAFUS entries (definitions, chemical form, or conditions of use may differ). _(src: EU Food & Feed Information Portal feed-additives register; parsed dataset pdf-parsed/eu_feed_additives_2023_1813.json, e_number 2b92457)_
🇺🇸 FDA (US) — EAFUS 52-90-4: L-CYSTEINE listed for DOUGH STRENGTHENER where applicable; CAS 52-90-4. _(src: FDA EAFUS, CAS 52-90-4)_
🇺🇸 AAFCO (US) — Ch.6: No stand-alone AAFCO OP 2024 Ch.6 entry for this substance. AAFCO defines substances only where a corresponding feed ingredient is listed; where absent, the cell is an honest gap, not a claim of non-existence. _(src: AAFCO OP 2024 Ch.6 — gap)_

🇨🇦 CA — honest gap: not listed in CFIT as a feed additive. _(src: Canadian Feed Ingredients Table (CFIT), inspection.canada.ca; SOR/2024-132)_

Crosswalk verdict

CN 公告2045 lists L-半胱氨酸 (scope 养殖动物). FDA EAFUS lists L-CYSTEINE (CAS 52-90-4, used for DOUGH STRENGTHENER) as a food substance. AAFCO OP 2024 Ch.6 has no stand-alone entry for this substance (honest gap). Verdict: CN↔US diverge in chemical form or regulatory framing; the pairing is the closest available US analogue, not a confirmed regulatory equivalence (EU filled from the EU Feed Additives Register (FFP parsed dataset)).

Species & use scope (适用范围)

Cross-jurisdiction species / use-scope dimension surfaced from each jurisdiction's retrieved source. CN 适用范围 is quoted verbatim from the 公告2045 饲料添加剂品种目录; EU target-species and FDA use-class reflect only what is already present in the topic's own cells (no new source fetches).

🇨🇳 CN (公告2045 适用范围): 养殖动物 _(src: 农业部公告第2045号饲料添加剂品种目录, 适用范围)_
🇪🇺 EU (target species): honest gap — target-species / conditions of use not present in the currently retrieved EU source (conditions_of_use deferred). _(src: EU Feed Additives Register — gap)_
🇺🇸 FDA (EAFUS use class): DOUGH STRENGTHENER _(src: FDA EAFUS, re-surfaced from topic FDA cell)_

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: EU Feed Additives Register (EU Food & Feed Information Portal; E-number 2b92457 = L-cysteine, category 2 b). First-hand-derived parse: pdf-parsed/eu_feed_additives_2023_1813.json.
FDA: FDA EAFUS "Substances Added to Food" (pdf-raw/fda_substances_added_to_food_20260718.csv, first-hand)
AAFCO: OP 2024 Ch.6 (pdf-parsed/us-2026/aafco_ch6_2024_parsed.json, first-hand)

L-半胱氨酸 — additive cross-jurisdiction identity