**6. Patents**

This study is a part of a more extensive project resulting in the registration of the Utility Model "Compound feed containing knotweed for game, domestic and farm animals".

**Author Contributions:** Conceptualisation, P.M., M.K. and J.N.; methodology, M.K., P.M., T.F., Š.V. and J.N.; formal analysis, T.F.; investigation, M.K. and Š.V.; data curation, T.F.; writing—original draft preparation, M.K.; writing—review and editing, all authors; visualisation, T.F. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by Technology Agency of the Czech Republic, gran<sup>t</sup> number TH02010325 within project "Innovation of feed supplements for fitness improvement of domestic and wild animals".

**Institutional Review Board Statement:** The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Institutional Ethics Committee of Mendel University in Brno, 21 October 2021. Feeding experiments are not applicable according to the law of the Czech Republic.

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Data Availability Statement:** Data are available from the third author.

**Acknowledgments:** Our thanks are due to the managers of the Regional Stud Farm Tlumaˇcov, Czech Republic, for excellent co-operation in both experiments. VUOS provided analyses of resveratrol in knotweed biomass. Graphic Abstract was prepared by BcA. Vít Kovár.ˇ

**Conflicts of Interest:** There are no conflict of interest.
