We keep three truckloads of cattle at a time on our cuttin horse place here.(Texas)We use Baytrol,Banamine,Nuflor,LA200,and Micotil the most. No B12,penicillin,asp. bolus,Probius, etc. I think those things are important for these cattle.My boss does not. I need the best recomendation for which vaccine I need to use on fresh yearlings, when they first get sick? Also what to use when they are doctored, re-checked the next day and are fine, but a few days later are sick again. I was told Baytrol, Nuflor, and Micotil do not work in extreme heat. I need an well experienced opinion. Also the factor of giving big shots, and splitting the dose(10cc in more than one spot. Isn't this a key role in properly administering a shot? To keep the area from becoming an absess? HELP PLEASE...