12. Have the herd examined at least twice a year by a skilled
veterinarian.
13. Promptly remove from the herd any animal suspected of being in bad
health, and reject her milk. Never add an animal to the herd until it
is ascertained to be free from disease, especially tuberculosis.
14. Do not move cows faster than a comfortable walk while on the way
to the place of milking or feeding.
15. Never allow the cows to be excited by hard driving, abuse, loud
talking or unnecessary disturbance; do not expose them to cold or
storms.