Calves are weaned around 6-8 months old. Your cattle should be wormed now if they have not been this year. Normally, we vaccinate the cows & calves 4 weeks BEFORE breeding (IBR, PI3, BVD, BRSV & Lepto 5 - clostridials - and Pasturella). We vaccinate calves again in the fall prior to weaning. Check with your local vet. Jeanne
