There are several reasons vaccines fail. Here are some mistakes to avoid: Giving the wrong sized dose, Incorrect timing, not reading the product label, Incorrect vaccine injection site on the animal. Learn more specific info from the University of Florida
Breeding Doe Livestock Judging Class from Texas A&M.
The main concern when working cattle is over-stressing them. I want to have a low stress facility to handle the cattle to keep them at good health. If cattle become to stressed, they may end up hurt as well as you. The best idea is to find a handling facility that works best for you as well as the herd. Paying for a better system now will go a long way in the future.