When we bought out piglets they had been wormed, but I was reading something the other day that said pigs should be wormed every 6 weeks. We will be butchering our pigs in 6 to 8 weeks; what is a good wormer that will have run it's course by the time we butcher? We have 6 and they are doing great. We bought them at just over 3 weeks old te end of May and now they are eating 100# bag of hog feed every two days. I'm not sure ifwe will be butchering them for the meat or to get them out of our bank account. These guys will weigh 125# to 150# apiece.