Annually for the stallions standing at DeGraff Stables, we record scrotal size, perform an overall health examination, periodic spermatozoal morphology evaluation and periodically culture of raw and extended semen. We track average number of sperm per ejaculate, average progressive motility, average seminal volume and average sperm concentration, pregnancy rate per cycle and number of cycles per pregnancy.

Additionally for cooled semen programs we check average progressive motility at 24 and 48 hours post collection and track average number of shipments per pregnancy for cooled semen.