i was in the same boat as you 2 weeks ago, vet told me i should induce at a week overdue, but with all the google searching i did and the horror stories i heard i let her go and i was going to wait til 2 weeks over to induce, well in the middle of the night on day 8 she calved. its your call...
with the value of the semen and embryos in my tank and im sure other peoples tanks, i would never ever go a year without filling it even if it could last that long. ill pay the 30 dollars every 3 months to have it filled... i would hate to check it one day and its empty...
otherwise google beef cattle vaccine plans or protocols, lots of information out there. i use once pmh, inforce 3, bovishield gold with lepto, and alpha 7