I am planting comfrey as well as fodder trees for my sheep, goats and other livestock. The comfrey grows the fastest obviously and will be available for feed next year. From what I have read, common comfrey has the least toxins. And sheep are the most resistant to those toxins. Bocking 4 is the next least toxic after the common variety.
My question is, I would really like to use comfrey next year in place of the grain/alfalfa ration for my sheep. I have planted primarily common comfrey so far, but will likely need to plant the bocking 4 to fill in the rest of my comfrey patches because of difficulty of finding more common plants. Does anyone here feed their sheep or goats comfrey in place of grain? Does anyone know of a safe amount of comfrey that can be safely fed to the sheep? And when people talk about safe proportions of diet,, are they referring to calories or bulk?