changing brands of vaccine

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WisRose

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I used Triangle 9+type IIBVD on my cows, we bought two new heifers and each was vaccinated with different brands of vaccine one with Master Guard 10 and the other with Bovashield. My question is, when I vaccinate again this summer do I have to start out new with the two shots or just a single booster shot?
 
Start using the vac program you are currently on this summer and booster that 30 days later or so. 2 shots to answer your question. Anytime you change vaccinations, you should booster. A booster is really meant for a 30-45 day follow up shot to really be effective at all to stimulate the proper immune response. The summer is too long for you to do any good.
 

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