Horse owners are naturally proud of their weanlings and yearlings. They want them to grow rapidly, especially if they are to be shown or sold.
Parasite control is an important aspect of management of young, growing horses.
But, just any deworming program may not work as well with all groups of horses. That is what extensive research over seven years on one farm in Ohio revealed. Specifically, parasite egg counts in young horses reached higher numbers sooner after treatment than in mares. The ERP is the time from deworming until parasite egg counts again become positive. This is usually four weeks after using regular dewormers and eight weeks after ivermectin.