Posted 4/14/2019 04:44 (#7438173 - in reply to #7436622) Subject: RE: Vaccination expense
Breckenridge, MI
I'm a feedlot guy so take my opinion for what it's worth.
I always thought the reasoning for using respiratory vaccines on cows was to have maternal antibiodoes shed to the newborn/young calf until the calf was old enough to develop it's own antibiodoes and mount an immune response to a vaccine.