Veterinary Andrology and Reproductive Techniques

MASS ACTIVITY

The collective movement of sperms or their wave motion is called as mass activity.

• Mass activity is estimated by keeping a semen drop on a warm glass slide and examining under low power microscope without putting cover slip.
• Mass activity may be classified into five grade scale depending upon the wave motion and rate of sperm activity.

  S.No.	Findings	Description	Grade
  1	Very vigorous forward motion, extremely rapid waves and eddies, about 90-100 % active sperms.	Excellent	5
  2	Vigorous, progressive movement with rapid and abruptly forming waves and eddies, about 70-80% sperms are motile.	Good	4
  3	Progressive rapid movement of sperm, slow moving waves and eddies, 50-60% sperms are motile.	Fair	3
  4	Oscillatory or rotary movement, no waves and eddies, 30-40% progressively motile sperms.	Poor	2
  5	Stationary bunting or weak rotary movements, 10-20% scattered progressive sperms.	Very poor	1
  6	Immotile sperms.	All dead	0

• The evaluation depends upon the experience of the operator.

Mass activity estimation is a subjective evaluation. In case of controversy, semen can be examined by another experienced person for opinion.

• 5 and 4^th grade samples are acceptable. Others should be discarded.
• (Click here to see video)

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