This is the only circumstance that I would ever recommend killed vaccines - and that's only if the cows had NOT recieved their MLV prior to breeding. As far as I'm concerned, killed vaccine is like pi$$ing in the wind. :banana:Dave":2hopsswv said:I have heard of people and even heard a vet one time talk about using killed before weaning and boosting with MLV after the calves are weaned and away from the cows. That is as close to alternating as I have heard of.