People care less of "long-term effect" of the vaccine because they assume the long-term side effect should be "lighter" than the short-term side effect. So, they gauge the possible long-term effect from the observed short-term effect. But if you know more about vaccine, or if you have been "anti-vaxxer", you have all those knowledges accumulated, you can learn/know instantaneously the current Covid vaccine is very very dangerous with 100% of confidence.
Those cows are Holstein supremacists for questioning the vaccine.
Pregsure was an "inactivated" vaccine type:
https://www.ema.europa.eu/en/medicines/veterinary/referrals/pregsure-bvd
https://en.wikipedia.org/wiki/Inactivated_vaccine
Among the current covid-19 shots available, some are also of the "inactivated" type:
BBIBP-CorV, CoronaVac, Covaxin, QazVac, TURKOVAC
Here's an article that actually explains the situation:
https://www.producer.com/livestock/bleeding-calf-syndrome-linked-to-diarrhea-vaccine/
People care less of "long-term effect" of the vaccine because they assume the long-term side effect should be "lighter" than the short-term side effect. So, they gauge the possible long-term effect from the observed short-term effect. But if you know more about vaccine, or if you have been "anti-vaxxer", you have all those knowledges accumulated, you can learn/know instantaneously the current Covid vaccine is very very dangerous with 100% of confidence.