I am trying to track down why zimercterin gold didn't take care of my itchy butted horses.
Is this true that ivermectin only kills the adults not the ova? Does anyone know how long it takes the ova to hatch?
When I wormed with the ivermectin none of the horses were itching and 6 weeks later almost everyone was?
Did the ivermectin kill the adults which prompted the ova to hatch BIG TIME?