VGO 511: Veterinary Andrology and Reproductive Techniques (1+1)

VOLUME

• Read from the graduated semen collection vial immediately after collection.
• Volume remains fairly constant for each species.
• Volume varies among individuals and between ejaculates within the same individual.
• Volume increases with age and body size of animal and changes with general reproductive health and vigour and frequency of service.
• Teasing and stewing of bulls are practiced to increase the volume of semen.

Semen volume increases up to 6-8 years of age.

Decreased volume is noticed in following conditions

• Young males
• Males used excessively
• Incomplete ejaculation or failure of ejaculation
• Bilateral seminal vesiculitis

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Volume of semen in difference species

Species	Volume of Semen
	Average (ml)	Range (ml)
Bull	4	1-15
Stallion	70	30-250
Ram and Buck	1	0.7-3
Boar	250	1.25-400
Dog	10	1.25
Cat	0.04	0.01-0.12
Fowl	0.75	0.25-2.0
Man	-	2-6
Elephants	-	50-100

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Nomenclatures for different evaluation criteria

Explanation	Terminology
No sperm	Aspermia
Reduced	Hypospermia
Increased	Hyperspermia

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