gender SELECTed 4M

Frequently Asked Questions


Exclusive sexed-semen product available from Select Sires. Learn more through the answers to frequently asked questions below or contact your representative today!

Is a 4 million sperm dose better than a conventional dose of Select Sires semen?
No. Our study has shown that a 4 million sperm dose in Holstein heifers has a conception rate that was 78 to 80 percent of the conception rate of Select Sires’ conventionally processed semen. These results were statistically signifi cant.

Does a 4 million sperm dose provide better fertility than a 2 million dose?
Yes. SexedULTRA 4M has shown a conception rate advantage of 3 to 5 percent in Holstein heifers based on the results of a recent trial conducted by Select Sires within some of the partner herds participating in the Program for Fertility Advancement.

Can this product be used on cows?
SexedULTRA and SexedULTRA 4M can be used on cows. You can expect to see reduced conception rates in cows, however the results between 2 million and 4 million will be closer than in heifers. We recommend use for fi rst or second services on cows showing strong, healthy heats.

How is this product labeled?
The ‘509’ stud code prefix is included for Select Sires bulls and the ‘559’ stud code prefix for GenerVations bulls. Straws and cane tops are yellow.

Will bulls have both 4 million and 2 million available?
No. At this point, bulls will either be available as SexedULTRA or SexedULTRA 4M, not both.

Artificial insemination straws of gender SELECTed semen are for single use artificial insemination of heifers only.