The Visual Guide to
Equine Reproduction
Male Reproductive System: Breeding Soundness Evaluation
Scrotal Width.
Special calipers are used to measure testicular diameter. Testicular volume is correlated with the quantity of sperm production. Scrotal width should be at least 8 cm, as one of the criteria in determining the final classification.
Asbury AC (1988)
Semen Collection.
The most common method of semen collection is with the aid of teaser mare, a phantom, and an artificial vagina. The immobile mare serves to arouse the stallion.
Asbury AC (1988)
Artificial Vagina.
This is the Missouri model of an equine artificial vagina. The water jacket is filled with warm water at a temperature of at least 42 to 43 degrees Centigrade. Older stallions frequently require temperatures over 45 degrees C to respond properly.
Asbury AC (1988)
Semen Pouch.
The sterile semen pouch contains a filter to separate out the coagulated secretions of the seminal vesicles. It is connected to the distal end of the artificial vagina.
Asbury AC (1988)
Lubrication.
Nonspermacidal lubrication is applied to the entrance into the artificial vagina.
Asbury AC (1988)
Stallion Mounting the Phantom.
As the stallion mounts the phantom the penis is deflected laterally and guided into the artificial vagina.
Asbury AC (1988)
Intromission.
As the stallion mounts the phantom, the penis is diverted into the artificial vagina.
Asbury AC (1988)