[Preparation of a realistic calf model for obstetrical instruction].

Construction of a largely realistic and flexible calf-dummy for the instruction and practice of veterinary obstetrical procedures is described. The most important steps are presented in detail and illustrated by means of figures. The fundamental materials include: threaded rods, artificial metal joints, hard foam with a coating of soft foam rubber for neck and trunk, a flexible metal tube filled with silicone to imitate the vertebral column and silicone acetate injected into moulds to form the limb segments and the head. The natural skin, which had been specially tanned in order to retain its elasticity, was sewed over the flexible dummy. Adherence to the original proportions and a realistic replication of the limb joints ensured that the flexibility and movement of the dummy approaches that of an original calf.