Currently I am working on CFA induced arthritic animal studies using medicinal plant extracts. How to fix the dosage concentration for the treatment of animal studies
We use the conversion table depending on the metabolic weight if we use phytotherapeutics from Human for animals. Perhaps that might help you (?)
Otherwise there are some books wich include lots of dosages for many Plants. The most extenive Collection in german Literatur you will find in "Phytotherapie in der Tiermedizin" Thieme Verlag, ISBN 978-3-13-240777-0, from Mathias Melzig and Cäcilia Brendieck-Worm.