The heads are “de-budded”

The dehorning cap is carried until incandescence then it is applied for 10 seconds on the horns. Cauterization of the wound, the horn buds disappear in two to three weeks.

“When this happened within the first three weeks, each time I always did it when the calf horns were under anesthetic.” Christian Meier, breeder

Art 16 LPA: intervention on animals

Interventions causing animals pain is only permitted under general or local anesthetic administered by a competent individual. (…) The provisions of the present law concerning animal experiments are not included.
Animal protection Law – Swiss Confederation