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

Species difference

SPECIES DIFFERENCES IN TESTICULAR CHARACTERS

TESTICLES' MEASUREMENTS IN FARM AND PET ANIMALS

Character	Bull	Stallion	Ram	Boar	Dog	Cat
Shape	Oval	Oval	Oval	Oval	Round to oval	Round to oval
Length (cm)	10 - 15	7.5 - 12.5	7.5 - 11.5	10 - 15	2 - 4	1.2 - 2
Diameter (cm)	5 - 8.5	4 - 7	3.8 - 6.8	5 - 9	1 - 2.5	0.7 - 1.5
Weight (gm)	200 - 500	200 - 300	200 - 400	600	7 - 15	0.7 - 1.5
Plane	Vertical	Horizontal	Vertical	Vetrical	Oblique	Verical

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SPECIES DIFFERENCES IN TESTICLES OF FARM AND PET ANIMALS

Bull

• Shape: Oval
• Length: 10-15 cm
• Diameter: 5-8 cm
• Weight: 200-500 gm
• Long axis: Vertical
• Head of epididymis: Lies dorsal to the testis
• Body of epididymis: Lies caudal and medial to the testis
• Tail of epididymis: Lies ventral to the testis
• Vas deferens: Lies parallel to the body of the epididymis and medial and cranial to it
• Location: Anterior prepubic region
• Click here to view animation

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Stallion

• Shape: Oval but compressed from side to side
• Length: 7.5-12.5 cm
• Thickness : About 5 cm
• Weight: 200-300 gm
• Long axis: Horizontal
• Head of epididymis: Lies cranial to the testis
• Body of epididymis: Lies dorsal to the testis
• Tail of epididymis: Lies caudal to the testis
• Vas deferens: Lies dorsal and medial to the body of the epididymis and testis
• Location: Intermediate to the prepubic and perineal region
• Click to view animation

Appendix testis
Remnant of the paramesonephric duct, present as a small protruding structure on the cranial pole of the testis. It is also seen occasionally in ram.

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Ram and Buck

• Shape: Oval
• Length: 7.5-11.5 cm
• Diameter: 3.8-6.8 cm
• Weight: 200-400 gm
• Long axis: Vertical
• Head of epididymis: Lies dorsal to the testis
• Body of epididymis: Lies medial to the testis
• Tail of epididymis: Lies caudal to the testis
• Location: Anterior prepubic region

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Boar

• Shape: Oval
• Length: 10-15 cm
• Diameter: 5-9 cm
• Weight: 500-800 gm
• Long axis: Vertical
• Head of epididymis: Lies ventral to the testis
• Body of epididymis: Lies cranial to the testis
• Tail of epididymis: Lies dorsal to the testis
• Vas deferens: Lies medial and cranial to the testis
• Spermatic cord is long
• Location: Caudal to thighs, caudal and ventral to the ischiatic arch (perineal region)
• Click here to view animation

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Dog

Shape: Oval Length: 2-4 cm Diameter: 1.2-2.5 cm Weight: 7-15 gm Long axis: Horizontal and oblique Head of epididymis: Lies cranial to the testis Body of epididymis: Lies dorsal to the testis Tail of epididymis: Lies caudal to the testis Vas deferens: Lies dorsal and medial to the body of the epididymis Location: Intermediate to the prepubic and perineal region Click to view animation

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Tom cat

• Shape: Oval
• Length: 1.2-2 cm
• Diameter: 0.7-1.5 cm
• Location: Caudal to thighs, caudal and ventral to the ischiatic arch (perineal region)
• Click to view animation

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