We sure would not go into season with out a good program, I Would have a visit with your vet he can help with setting up a program that works best for you, We used Scourgard KC for years and had very good luck with it, Was visiting with our vet a few years back, he said he would like us to try the new Scour Bose 9, If I remember correct he wanted us to give Scour Bose 3 the first time in the fall when we preg. with a second in mid winter with Scour Bose 9, then yearly there after with just the Bose 9. It does work much better for us because we now just give Scour Bose 9 when we preg. With the Scourgard KC he wanted us to give it to them closer to calving so we had to work them again closer to calving. Good luck 101