Paul, I used to think there was a cookbook answer, but not anymore. For years we relied on scourguard 4kc, then scourbos 9. In the last few years I have seen several failures with scourbos; failing to protect from rotavirus, e coli, and enterotoxemia. Personally I think the vision 7 we all use now is not doing a good job of giving carryover protection for perfringens in the colostrum. I have gone back to ultrabac. One farm we had to use both scourbos and scourguard to protect from rotavirus in the fall calves, but scourbos alone worked on the spring calves. A good necropsy can really help answer questions as long as your vet keeps an open mind and does not let finding one pathogen blind him to the fact that disease is almost always multifactorial.
We use Ultrabac and Scour Bos 4 prior to calving and they seem to work. The Scour Bos 9 would be even better, but it costs more, and we have not had issues with the Ultrabac and Scour Bos 4. I have heard it is different for management styles.
Post by strojanherefords on Feb 2, 2019 23:52:34 GMT -6
Thanks for the responses. Tim, you're not the first person who has told me that vaccines have stopped working. In your opinion, why do you think the vaccines no longer work like they used to? With all the mergers and re-organizations, I don't have much confidence in the pharmaceutical companies. On the other hand, have we created a genetic naivety in our cattle by removing disease pressure? Fortunately, we haven't had much of a death loss from scours. So there isn't an opportunity for necropsies. I think that is because we calve during our dry season, we don't have much of a problem with scours until the rain comes and the calves are 30-90 days old. When the calves get to that age, I question the benefits a maternal vaccine will provide. I think the best we can do is select for healthy animals.
Paul, in the case of vision 7, I don't think it was ever as good an antigen as the older, less refined vaccines. Vision was developed as a "cleaner" vaccine with less injection site reaction as a response to BQA standards. Less antigenic mass gives less immune response. We all run larger cowherds and have more exposure to different strains of pathogens. You just brought in cows from Northern Alberta along with whatever indigenous pathogens those cows carried in their lungs and intestines. All of a sudden you have altered the microflora of your cowherds. Your current vaccination protocol may no longer be adequate. The biggest issue I see with mergers in the animal health industry is the loss of products that worked well but have a small market. Also, fewer and fewer of the decision makers and research leaders have a farm background and an innate understanding that a problem exists and should be addressed. We all want smaller government, but along with that comes less basic research. That leaves private industry to do the basic research and a young CEO trying to impress his board and shareholders with short term financial gain is not likely to fund long term projects with an uncertain income potential. In short, the scientific tools are better than ever, but the ability and drive to use those tools are becoming more short term and profit driven.