Here is some wonderful advice from a fellow Planet-eer. Cowboy
We use a spring AND fall vac program on the cows.
In late gestation -- no more than 30 days prior to calving, I give the cows a dose of Scour Gaurd 4-K-C along with a booster of Vision 7 or 8 with spur.
I use Bovi-Shield Gold 5 or better after calving in the spring, at LEAST 30 days prior to breeding them back -- that is very important.
In the fall I come back after weaning and booster them all with the killed form of the same viruses -- usually I use Cattlemaster 5 -- which is safe for pregnant cows.
Make sure you are getting the most current version of Lepto -- the Hardjo Bovis is a real killer -- if yopu have lots of deer around -- make sure you get that in there.
Calves -- I only use a Shot of Alpha 7 at birth here -- but we have been very diligent with the clostridiums on the cows as listed above.
At 30 days, I booster the calves with Vision 7 (Do not use Alpha again) and possibly give them TSV-2 (Pi) and meybe in wet years a shot of Pink Eye vaccine -- this will help later when the weds get big and start causing problems with eye damage.
When I wean, 2 weeks prior to weaning I give the calves a dose of Cattlemaster OR Triangle 5 - make sure it is killed strain virus.
At weaning, I give the calves all a dose of Bovishield Gold 5 LV -- and they are done. EASY right!! hehehe
At birth CXD antitoxin, may Ultra 7/sombac, bovishiel 5, nasalgen,once pHM, cows get anthrax and Preg 10
Fall oneset, PHM, ultra 7/sombac- booster oneset and Somnus
It isn't cheap, but one dead calf more than pays for it.