Spire notes most vaccines state
on the label that calves younger than 6 months of age should re- ceive boosters. In some cases they’re more specifi c, saying the boosters should be administered within a certain period after initial vacci- nation, perhaps 3 to 4 weeks after. The intention, he says, is to exact the maximum benefit from that particular type of vaccine. Producers need to read the label
and understand that for most vac- cines given to calves aged 2 to 4 months, one shot doesn’t fi t all for all vaccines. Many require a booster by weaning. It’s important to remember that
AERWAY
despite the availability of vaccines, calves are still going to be exposed to disease. Spire says, “Unfortu- nately, we can’t just put a shield around them and protect them.” Vaccination will reduce the severity if a pathogen does get into a calf, and it will also reduce the degree of replication. “An analogy is when you get the
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A vaccinated calf protects other calves A protected calf also will not
shed virus in numbers as large as will an unvaccinated animal, and that reduces the potential for a mas- sive disease outbreak in the herd. “You may see some sickness, but
it’s not going to be severe. It’s not going to last as long,” Spire says. Even if just 80 to 90 percent of
PORTABLE & STATIONARY SYSTEMS 82 The Cattleman August 2013
the calves are protected and the rest are susceptible, the level of pathogens in the herd is suppressed
thecattlemanmagazine.com
fl u. You may have had a low num- ber of viruses that come in, but as the disease process goes on they replicate and your clinical signs get a lot more severe. Because of vaccination, the disease signs are a lot less.”
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