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.
• After that it is maintained for some period and starts declining afterwards.

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	125 - 400
Dog	10	1 - 25
Cat	0.04	0.01 - 0.12
Fowl	0.75	0.25 - 2.0
Man	-	2 - 6
Elephans	-	50 - 100

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Nomenclatures for different evaluation criteria

Explanation	Terminology
No sperm	Aspermia
Reduced	Hypospermia
Increased	Hyperspermia

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