seems to me the way to know if your worm control method is working is the same way you do in horses/goats/sheep... take a fecal sample to your vet for a worm count (they look at worm eggs in the poo), treat with your chosen method (pumpkins or whatever), wait 10 or 14 days, treat a second time, wait 10 or 14 days, take a poop sample for a count, and then again in 30 days, take another sample.
if you've got worms, you've got worm eggs in the poop. if you have fewer worms, you'll have fewer eggs. since there are no conclusive studies on dosages, methods, and chemical vs. natural, that's the only way I can think of to know for sure.
cuts down on the presumtions, the placebo effect (on human belief) and on the contention over best methods.
I may do this, just to satisfy my curiosity.
BTW, when people are talking about using buttermilk, they're talking about cultured buttermilk? not the buttermilk that's left after making butter from milk?
just checking...