Well, it is possible to eliminate the vet completely. But may not be the best plan if you want to establish and maintain a good relationship and receive quick consultations. Just saying. Some people unsuccessfully try to establish that relationship during a crisis or late at night.You'll save a bunch of money, time, and aggravation if you can eliminate the vet as much as possible in your operation.
The only things that I currently rely on the vet for is semen testing bulls and pelvic measuring heifers. My next goal is to aquire one of the gauges that they use for pelvic measuring so I can eliminate that as well.
I do often purchase my meds through the vet office and maintain a good relationship so that I can call and consult with the occasional odd health issues. This service can be invaluable.