I went to a seminar Wed night on the latest worm research. I found out my Dad and I were right! We have never done this every 2 month thing. Worms have now become 'power bugs', like bacteria and are resistent. The summary is:
1. Do not worm if not needed.
Do fecal count on all horses twice a year and only worm those who need.
2. Good pasture maintenance
Do not have too many horses/acres
Lime and fertilize (lime will kill those it touches)
Either pick up manure or let lie, do not spread (only spreads worms)
Worms die in 3-4 wks in summer, but can live 6 months or longer in winter
3. Increase nutrition
should be 11-12% feed, pasture, hay
add loose minerals to diet
I probably forgot a few things and hopefully others who were there will add to this. It was stressed we are only 5 yrs away from not having a worm med that works at all. We have to change now!
Blessings, Linda Grajewski