Looks like I am responding to an old thread but this is very useful information. I am new to cattle raising as well. I have 4 angus cows. 2 have calved and 2 are 'expected' to be pregnant. I have been reading about a brucellosis vaccine called RB-51. Is this necessary along with the others listed in this thread? Are all of these vaccines administered by me or does a vet have to administer some/all. One more question...If administered by me, can I just get them at our local feed store? Thank you!