I am just wondering how often I should worm Bretty & Gunner? They where wormed in March with Equilan due ( sorry about the spelling ) and have since been on a herbal wormer ( Micronisate phytovap ) which is has mixed in with there feed once a week plus all the grazing since march has been on ground that has not been grazed for many years if ever, I also poo pick every day. so can I A, getaway without useing chemical wormers at all or B, Should I do them twice a year (spring & autum ) with something like equilan due?