enough to ward off a severe disease outbreak. “If we have colostrum in there, the calf then will use those colostral antibiotics to fi ght off the infection. But again, the calf does become infected; there’s no impen- etrable shield around him.” Boostering is also critical be-
cause it allows the rancher to know he or she has a base level of pro- tection. Spire says, “At some other point in time — say weaning, in this example calf — when we re- vaccinate them, we get a really big jump in the immune protection level. With the fi rst shot we will raise the immune level to a point, and then when we booster them we really kick that level up higher. That will be sustained for a longer period of time.” The level of immunity from a
vaccine, and the length of time the immunity lasts, both vary. As a result, vaccinated calves can still suffer illness when the protection starts to wear off. Parainfl uenza 3 (PI3) provides a short duration of protection, as does BRSV (bovine respiratory syncytial virus). “We may only get 2 to 3 months’
worth of protection out of those types of vaccines,” Spire says, “whereas with the IBR (infectious bovine rhinotracheitis) or BVDV (bovine viral diarrhea virus) com- ponents, we may get months and months. We’ve shown up to a year of protection in experiments that have been conducted with those 2 particular viruses. So the closer we are to the time of vaccination and that disease exposure, the more comprehensive we see the protection level in those exposed animals.”
Vaccinate on the calf’s schedule, not yours Spire stresses the importance of reading the labels and follow-
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August 2013 The Cattleman 83
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