# Commission Regulation (EC) No 429/2008 of 25 April 2008 on detailed rules for the implementation of Regulation (EC) No 1831/2003 of the European Parliament and of the Council as regards the preparation and the presentation of applications and the assessment and the authorisation of feed additives (Text with EEA relevance), Division 3.2.2.5.2: Prenatal developmental toxicity study (teratogenicity study)

Extent: E+W+S+N.I.

The objective is to detect any adverse effects on the pregnant female and the development of the embryo and foetus as a result of exposure from implantation through the entire gestation period. Such effects include enhanced toxicity in the pregnant females, embryo-foetal death, altered foetal growth and structural abnormalities and anomalies in the foetus.
The rat is usually the species of choice for the first study. If a negative or an equivocal result for teratogenicity is observed, another developmental toxicity study shall be conducted in a second species, preferably the rabbit. If the rat study is positive for teratogenicity, a study in a second species is not necessary except where a review of all the core studies indicates that the ADI would be based on the rat teratogenicity. In this case a study in a second species would be required to determine the most sensitive species for this endpoint. Protocols should be in line with OECD Guideline 414.

---
Source: https://www.legislation.gov.uk/eur/2008/429/annex/II/division/3/division/3.2/division/3.2.2/division/3.2.2.5/division/3.2.2.5.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2008-429/annex-II/division-3/division-3.2/division-3.2.2/division-3.2.2.5/division-3.2.2.5.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.