i am planning to purchase 40 to 50 young heifers around 400lbs during Dec., breed them next Nov-Dec, and calve them in Aug-Sept of 2011. Also, by the beginning of Jan-Feb of 2010, i will buy more heavier heifers so i could plan to breed them with the purchased heifers in Dec of 2009. The problem is i don't want to introduce a bacteria called campylobactuer foetus(vibriosis) in my herd that may affect the fertility of the future herd from my friend bulls, which he leases regularly. The other option is to purchase several calf bulls and raised until around 15 months old to breed and them sell them. Time is not the issues nor the money because i have another job. Please keep the advises in regard to renting a bull or purchasing calf bulls to prevent Vibriosis for my future herds.