There is none. It is a carry-over recommendation from dosing in mares when used to help them with "mare issues".
In PPID, it is dosed daily with no breaks. Whether you stop it for the winter to allow a full coat to grow in or not (if it is working for your horse to help with shedding) is also an option.
Lavinia, George Too, Calvin (PPID) and Dinky (PPID/IR)
Nappi, George and Dante Over the Bridge
Jan 05, RI