I have heard so many people say the same thing as you have, Shortdawg, that is, that they get so many bull calves from their ET. I am not sure why, but I have experienced a large number of ET heifers, and I really have no idea why. Four years ago, we implanted 18 embryos, had 17 pregnancies and had 18 heifer calves. ( the first to calve had identical twin heifers from an embryo splitting). Three years ago , I implanted 24 embryos and had 13 pregnancies and had 11 heifers and 2 bulls. Two years ago, we implanted 32 embryos and only had 14 pregnancies, ( for some unknown reason) but all 14 were heifers.Last year, we implanted 29 embryos and had 21 pregnancies, and we have 13 heifers and 8 bulls. I have also heard lots of people who say they get lots more heifers from grade 2 embryos than they do from grade 1's. In our case, I can see little differnence between grade 1s and 2s, or between fresh and frozen in regards to pregnanies and also sex of the calves. Maybe things will even out and I will have lots of bull calves for the next 3 or 4 years.
