This could result in the development of an inappropriate immunity. It is important that vaccines be given at a time in the animal's life when immunity is likely to develop. Passive immunity in the calf lasts from 3 to 8 months of age. The age or time at which a disease is most likely to occur. When the animal is most likely to be able to build immunity free from the affects of stress, poor nutrition and young age.
Vaccines are only as effective as they are properly used.
Be sure to know how the vaccines work and what they will work for. The calving season, and especially the length, has a large impact on cost, production and marketing of feeder cattle. However, most cow-calf producers in Tennessee and the nation fail to realize the benefits. A national survey of 2713 producers from 23 states revealed that 46.4 percent had a controlled calving season. Thirty-six percent had one season while 9.8 percent utilized two calving seasons.