Lecture 26: Stallion Breeding Soundness Exam

• Describe where the free portion of the penis is located and where the prepuce attaches to the penile shaft

• Identify the urethral sinus, urethral process and urethral fossa of the stallion’s penis

• Define the basic steps of the stallion breeding soundness examination

• Explain when a stallion is sexually mature

When it is about 5 years of age and This is when total scrotal width is >100mm

• Interpret the relationship between testicular size and daily sperm output

The larger testicular size, the higher the daily sperm production, as testicular volume is directly correlated with sperm output.

• Explain what a flowered or belled penis looks like

• Describe characteristics of a stallion demonstrating the Flehmen response

This is Stallion reproductive behavior they may also

• prancing, talking, biting

• temperment, libido, erection, mounting, intromission, ejaculation

• Differentiate between a Colorado, Missouri and Roanoke artificial vagina

• Interpret semen analysis for volume, concentration, morphology and motility

• Interpret the meaning of high vs low alkaline phosphatase concentration in semen

>3,000 U/L indicates true and full ejaculate

< 3,000 U/L indicates a partial or incomplete ejaculate.

• Identify common semen defects and classify them as primary defects vs secondary defects vs normal

• Define the number of progressively motile, morphologically normal spermatozoa needed to be a satisfactory potential breeder

• Calculate the progressively motile, morphologically normal spermatozoa given the results of a stallion BSE

• Calculate how many mares can be bred with an ejaculate given the results of a semen evaluation