Veterinary Andrology and Reproductive Techniques

DURATION OF SPERMATOGENESIS

Entire spermatogenesis takes about 50-60 days in boars, 60-70 days in bull and ram.

• Spermatogenesis comprised of four to five cycles of seminiferous epithelium.
• Cycle of seminiferous epithelium is defined as series of stages/changes between two similar cellular associations in the given area of seminiferous tubule.

The time necessary to complete a cycle of the seminiferous epithelium is called duration of spermatogenesis and varies among domestic animals

DURATION OF THE CYCLE IN DIFFERENT SPECIES
Species	Days
Boar	9
Ram	10
Horse	12
Bull	14

Spermatogenic wave

The distance between two similar cellular associations in the seminiferous epithelium is called spermatogenic wave.