A stallion who is frozen and found to have about a 45% progressive motility post thaw - would that be considered average, below average, above average?
Posted on Tuesday, May 06, 2003 - 12:44 pm:
This is a hard question to answer correctly!
Anything over 30% is generally accepted as being suitable for commercial release, but it is the total number of progressively motile sperm (PMS) that are inseminated that is most significant. If one has 30% PMS and want to inseminate 200 million PMS, and each straw contains a total of 200 million sperm (common for half-ml straws), then one would have to inseminate 4 straws. OTOH, if the stallion's PTM is 60% one would need only 2 straws. Remember it is the number of PMS inseminated that is important, not the percentage.
One also needs to consider that there can be excellent motility with zero fertility! So again, that %PTM is a somewhat academic figure to judge by. "What is the first-cycle conception rate of this stallion's frozen semen" is the question to ask. The answer should be something in excess of 50% (one has to allow for unsuitable mares, poorly handled semen and other issues outside the stallions control).
Having said all of the above, I would be satisfied with 45% PTM - as long as I was getting a good first-cycle conception rate with it!
SouthernCross Posted From: 126.96.36.199
Posted on Tuesday, June 10, 2003 - 10:51 am:
We're using frozen a lot in our barn and what we are seeing 70%. We are catching first-cycle.
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