Also, one thing to keep in mind is changing the environment of these cows. We bought 60 hd one year to put eggs in and didn't get them home until like 2 weeks before we implanted the eggs. Only got 20% of those to stick. Out of 120 of our own recips we got 77% that same yr. The next year those same 60 cows went for 80% and never were below 60%. We believe that this is strictly because we did not let them acclamate to the new grass type, mineral program, and just the overall stress of being hauled and worked.
You probably already know this, but I just thought I would share our experiences.