Veterinary Andrology and Reproductive Techniques

GROSS MOTILITY AND MASS ACTIVITY

Gross motility - Wavy movement of sperm when observed under naked eye.
Mass activity - Collective movement of sperm when examined under microscope with out cover slip.

• Mass activity is observed soon after semen collection.
• A drop of semen is placed on a slide and examined for mass activity using a light microscope under a magnification of 50X without cover slip.
• The activity is graded as described by Settergren (1984).

GRADE	CLASSFIFICATION
0	No mass activity
1	Slow wave motion
2	Rapid wave motion
3	Eddies

• The bulls used in AI programme should have at least a gross motility of grade 2.