Ex Bats and worming

Any one know how long you should wait before worming ex battery hens :?:

Yes - worm them straight away. i use the vermX granules, but would like to know how often to do this ...i know they say every month, but i can't believe that is really necessary - surely not through the winter ?  I have had my 8 x caged x batts since september and have wormed them twice. Most of them have feathered up and look reasonable now. I used to use flubenvent - but its hard to measure out for a few birds, and i don't want to lose the use of any eggs. I make my own dry mix  ( barley, oats, wheat bran, alfafa, seaweed powder, mixed seeds ) up to supplement the layers feed and add garlic granules to that as a natural anti parasitic, and i apply ivomectin to the back of the hens necks twice a year for good measure.