Semen Evaluation

Semen is usually collected from bulls by use of an artificial vagina (AV) or by electroejaculation (EE). Semen collected by EE is often more dilute and may appear to be less motile than that collected by AV, although total sperm per ejaculate and sperm viability should be essentially similar (assuming the EE collection has been successful and complete). As fresh semen is very susceptible to environmental influences, procedures should ensure that it does not come into contact with excess heat, cold or toxic substances. Initial assessments that require live sperm (eg motility) should be done as quickly as possible after collection.