Desmond, T., Laule, G. M., McNary, J. 1987. Training to enhance socialization and reproduction in drills. American Zoo and Aquarium Association (AZA) Regional Conference Proceedings, 352-358.

The females were trained to present to us by positioning their hindquarters right up to the fence. We then desensitized them to a smooth plastic syringe casing being inserted into the vagina. This behavior would allow frequent artificial insemination of the females without restraint or anesthesia. Our strategy was to train Sam to masturbate on command in a specific location where the semen could be easily collected. [Training techniques are not described.]