BCCC, to answer your question about the lute @ breeding, that is wrong. Pick up one of the sire directories and in the back they almost all have many different protocols listed. Pick the one that best fits your operation and study, study, and study it some more until you have it and it makes sense to you, then go and apply it. Please go back and read my post about what I would do and also go back and try to find some of Cowboy's and Shorty Queen's post about how they AI, it will again make you a MUCH better heat detector if you can understand what we are trying to convey to you and your question about your tech being correct about his info on the 12 hours after you see standing heat, that is by all current standards the pat answer to the question, but what I am trying to get you to understand is that they have to have an answer to that general question and so that is their answer, "12 hours after standing heat is observed". What I am trying to get you to realise is that you can go beyond the standard, pat answer, and make yourself better than average.
To answer your question about the heifer jumping other heifer, yes it is "A" sign that something "maybe" happening or about to happen, but you have to somehow get that great positive read, that yes, this heifer "locked up" and stood hard when another animal jumped her, preferably more than once. Like I said B4, it is much harder to get these signs read when the cattle are being tied up daily, but you have to be smart about it and do like Cattledog said he does, put her out with a small group of cows or a different peer group. I hope this helps. I think that you may be getting overload as far as too much info. Go study and get it straight in your mind then go and apply it. Try super hard to be patient. I spend many, many hours watching and as you perfect your heat detecting practices, you will end up being a great detector. Patience and a boat load of time. You'll get it done and be great. Good Luck. Brent