I have a very small sample size to go by, but I am thrilled with the early results of using ST Genetics SexedUltra 4M semen. I recently bred four Black Angus cows with Connealy Concord female sexed semen and it appears that all four conceived on the first insemination. I am now 27 to 42 days past those original insemination dates, no one has come back into heat, and next month will get the cows ultrasounded to confirm everything -- unless someone comes back into heat unexpectedly. We used natural heat detection (no timed or synched) and A.I.'d between 16 and 22 hours after observing standing heat. ST Genetics' protocol says to AI 18 to 24 hours after observing standing heat when using the SexedUltra 4M product. I believe this bull was $45 per straw for the female sexed semen. Most of ST Genetics' Black Angus bulls are $35 to $45 for sexed semen, though a couple are higher. Based on these results, I would definitely order more of the sexed semen from ST Genetics.
Mncowboy, is the Bismarck sexed semen you're referring to the old stuff Genex had up until a couple of years ago or are they offering the new SexedUltra 4M? I didn't see that on the Genex website tonight. I did use the old Bismarck female sexed semen through Genex when it was available for several years and had good overall results -- but not 100 percent conception like this year.