You have to pull hair or blood send it off and get it tested for CA i think Pfizer was running some deals on the test at one time. If she comes back positive you will have to check all her calves or just settle for commercial. Whoever you bought her from should have known this, if they were any kind of breeder at all they should have explained it to you before the sale of that animal if it was private treaty. sometimes they put them in a registered sale and its kinda up to u to do your homework, anymore if im interested in a animal from a sale i look up the registration #s