Simple portable stanchion for restraint of a teaser mount. Basically what the breeding bull needs is an immovable mount. The mount does not have to be in heat and can be another bull, a steer, or a freemartin heifer.
A teaser mount, like this heifer in estrus, may be restrained backwards in the headgate of a squeeze chute to observe the serving capacity of the bull.
The bull checks the pheromones of cows in heat by sniffing vaginal mucus or urine to determine whether the cow is in estrus. He aspirates the pheromones into his vomeronasal organ.
Guernsey bull with spastic syndrome, also known as Stretches. Severe acute attacks may interfere with copulation due to prolonged spasm of the muscles of the hindlimbs and back.