
My girl was standing for the male from day 7 and was way off even ovulating (tested on the day for the first time)....
Progesterone testing however told us she ovulated on day 12 and he mated her on day 14, would not mate before that so it all tied in together.
He would just court and play & keep close eye on her. If we were not testing, from her behaviour I would have got stressed we are going to miss it as she was soooo ready but he said no, not wasting my energy :-). She is expecting a large litter from that one mating.
I think it is also useful to know what is going on as lets say she misses, if you have done testing you know you mated at the right time etc so helpful for the next time. If you have not tested, you are left wondering if you mated too early/late and I have also known of a bitch who never ovulated on a season (the male knew this though and would not mate), again because of the testing they knew it was not that he did not wish to perform but that for some reason she never ovulated... This was recently so maybe she will have a split season and will go on full blown season at later date, again useful to know the season she had was not a full one so if she goes to continue, they know it might be a split season and not get overly worried if she comes in again soon.