When erection is achieved, the penis is rinsed with warm water from the squeeze bottle. This usually elicits some engorgement of the glans penis as well as shallow pelvic thrusting. The plastic bag is then placed over the shaft of the penis and secured with one hand placed proximally to to the preputial ring. The other hand is placed over the glans penis with the thumb behind the corona, as shown in figure 1. As the horse thrusts forward, the hands follow the thrusting motion.
Steady pressure is maintained on the shaft.
Simultaneously, the glans is rhythmically massaged with rotation motion, with the thumb massaging the firm protuberance of the corpus cavernosum penis into the glans penis. During initial training of a stallion, the position of the hands as well as the rhythm and strength of the pressure applied on the shaft and glans are varied depending on the response of the stallion, with the goal of inducing deep pelvic thrusts and engorgement of the glans characteristic of normal copulatory response. The stallion must be allowed freedom to lower the head when thrusting. Ejaculatory pulses are easily palpated and visualized. Premature release of pressure seems to interrupt ejaculation in some stallions.