Veterinary-drug residue limits — the three frameworks behind pet-food ingredients
Pet food made with animal-derived ingredients sits downstream of the veterinary-drug residue regime. Three major frameworks set maximum residue limits (MRLs); all three target food-producing animals, so their direct applicability to companion-animal pet food is limited — but they govern the residue limits on the ingredients that may enter pet food. Each description below is a verbatim substring of the first-hand source.
European Union — Regulation (EEC) No 2377/90
Council Regulation (EEC) No 2377/90 of 26 June 1990 "lays down a Community procedure for the establishment of maximum residue limits of veterinary medicinal products in foodstuffs of animal origin", applying to "pharmacologically active substances which are used in veterinary medicinal products in respect of all the various foodstuffs of animal origin, including meat." Substances are classified into four annexes:
- Annex I — substances for which MRLs have been established.
- Annex II — substances where no MRL is needed for public-health protection.
- Annex III — substances with a provisional MRL.
- Annex IV — substances for which no MRL can be established; "the administration of the substances listed in Annex IV to food-producing animals shall be prohibited throughout the Community."
United States — 21 CFR Part 556
In the US, residue limits for veterinary (new animal) drugs are set as tolerances under 21 CFR Part 556. Per § 556.1 Scope, the Federal Food, Drug, and Cosmetic Act "requires an applicant seeking approval or conditional approval of a new animal drug to submit a proposed tolerance … when such a tolerance is needed to assure that the proposed use … is safe." Each substance sub-section lists the commodity (target tissue), the tolerance (ppm / µg/g), and the § 500.4(d) regulatory status — the US analogue to the EU 2377/90 framework.
China — GB 31650-2019
China's national standard GB 31650—2019 (食品安全国家标准 食品中兽药最大残留限量 / National food safety standard — Maximum residue limits for veterinary drugs in foods) was issued 2019-09-06 and implemented 2020-04-01. It supersedes the relevant parts of 农业部公告第 235 号 (Ministry of Agriculture Announcement No. 235) and covers 食品动物 (food-producing animals), with sub-categories including 鱼 (fish).
The common thread
All three are food-producing-animal regimes. Pet food's exposure is indirect — through animal-derived ingredients whose residue controls trace back to these limits. A pet-food safety assessment should therefore read ingredient-origin residue rules against the source animal's framework, not assume a pet-specific standard exists.
Sources
vet_drug_mrl_eu_2377_90— EU Reg (EEC) No 2377/90: Community MRL procedure for veterinary medicinal products in foodstuffs of animal origin; Annexes I–IV classification (incl. Annex IV prohibited substances).vet_drug_mrl_us_cfr556— US 21 CFR Part 556: tolerances for residues of new animal drugs in food; § 556.1 scope and FD&C Act proposed-tolerance requirement.vet_drug_mrl_china_gb31650— China GB 31650-2019: national MRL standard for veterinary drugs in foods; issued 2019-09-06, effective 2020-04-01, supersedes 农业部公告第 235 号, targets 食品动物.