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Seeds for genetically modified maize NK603 are not freely available for cultivation in Europe and test material is purchased outside Europe.

All maize material (GM, near-isogenic and conventional varieties) used for feed production in the frame of G-TwYST was available on the market. The G-TwYST consortium did not sign any contract with the variety and event owners.


The diets purchased for the feeding trials are nutritionally balanced and serve the trial design. Diets for the long-term feeding trial are ordered batch-wise because of limited shelf life. All diets shall be produced according to GLP standards. Diet suppliers shall warrant that no other transgenes than those expected are present.

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G-TwYST Conclusions & Recommendations

29 April 2018


At a Conference held in Bratislava, Slovakia, on 16 April 2018, G-TwYST presented draft conclusions and recommendations regarding guidance on the design, conduct, interpretation, and analysis of animal feeding studies and their value for GMO risk assessment. A final version of G-TwYST Conclusions and Recommendations can be downloaded here.

Final programme 28/29 March available

18 March 2018

The final programma for the G-TwYST stakeholder consultation workshop on March 28 and 29 in Antwerp is available now and can be downloaded here.


This workshop, which is open for interested stakeholders, will focus on the draft results of a 90-day feeding study with 50% inclusion rate of GM maize NK603, as well as a combined chronic toxicity and carcinogenicity feeding study and the overall draft conclusions. Also included in the scope would be proposed quality criteria for whole-food animal feeding studies, and preliminary conclusions on the scientific value of such studies for GMO risk assessment. An additional agenda item will be insights from an analysis of scientific controversies around animal feeding studies including the GMO case.



Written comments, including from interested parties not able to attend, are welcome, and should be submitted before 6 April. Please, note, due to the tight schedule of the final phase of the project, this will be a firm deadline.