I had read Linda Woodrow’s book, The Permaculture Home Garden before returning back to the village block and distinctly remembered her advise to include a range of herbs in the chook bucket so they could self medicate.
Over the years since I have included a wide range of herbs in my chooks diet and have never had any problems with their health. Predominantly the herbs I have used are thyme, rosemary, oregano, fennel, tarragon, parsley, basil, coriander … the list goes on.
From references I have learnt that herbs often accumulate micro-nutrients. Linda lists these in relation to use in the compost as mulch, and specifically mentions yarrow and thyme being beneficial for chickens to “dose themselves against intestinal worms”. There is also a cautionary note about using some herbs like comfrey which contains an alkaloid called pyrrolizidine and could be unhealthy in large doses to chickens.
I also use…