Apparently 20% of horses carry 80% of the worms. Jack's FEC is always clear but Gracie always has a medium count.
My vet says only to worm count during the spring/summer. So do a FEC about 6 weeks after the last frost (about May?) and then repeat in July and September. Worms are killed (or just not active?) in the winter so you don’t need to worry about them then.So which months would you do FEC if you do 4 times a year samples.