Thanks, I did not know that horse paste in the UK was 18.75! I learned something very helpful, thanks!
So if I were going to use that on my chickens I would give 0.12 ml per pound instead of 0.23 ml per pound.
I found this about de-worming rabbits with fenbendazole:
20 mg/kg fenbendazole daily for 9 consecutive days.
That works out to 0.09 ml per pound for nine days.