I feel worming is very important but can be over done. I feel if there is good pasture management, all horses wormed at the same time I don't feel you should have to worm as often as some one who boards and worming is done by the owner. there are things that can help min. the amount of worming that needs to be done like not spreading manure in the pasture, cleaning and cutting down the pasture having goats or sheeps to share or alternate pastures.
but for those of use who board most BM spread the manure in the pastures or simply don't do pasture maintenance. witch makes worming very important. with out regular worming a horse can become heavy with worms and this can cause many problems. over worming can also cause probs. too. we all know about wormers becoming ineffective. over worming can do this. my conclusions is that I don't think there is a right answer to this question... but if the vet has to come out one of the first questions is when your horse was wormed last, when a horse is colicing, itchy, lose of weight, and poor coat and I am sure others.
I think it is important but can be unnecessary i feel the spring and fall are the most importent times to worm, a cool wet summer is importent, a hot dry summer is less importent, but if a horse is in a crouded pasture....

i dont know that is a hard one :lol: i worm every 2 months, but i board my horses out and they are pastured with a hurd and some do not worm there horses... so i feel it is importent for "them" to be wormed.

on the other hand i have goats at home and they get wormed 2x a year start of spring, start of winter. but i control there pasture and they are worm "free" :wink:

loved the question got me thinking why i do what i do and even though that maybe i was over doing the worming. can wait to hear what everyone else thinks......