Just wandering if any one out there was familiar with Endovac Bovi? Am I correct that if you vac a cow three weeks before calving it will work against all the gram negative antigens? Bascically protect the calf from E-coli, pasturellia, scours and provide coverage from mastitis to the cow? Any help would be appreciated. Talked to the vet but want to know how it works in the real world not in a lab.