
Hopefully someone will come along with an answer, I find these tests bewildering, some times they work other times they don't and seems to rely alot on who is interpreting them.
Some bitches are floozies and will "stand" throughout the season, others are not keen on being mated whether thay are " ready" or not, like wise some studs will mate any time, the best will only perform at the optimum time with greater success in getting pups out of the mating.
I use saliva tests [now that I have a microscope] combined with the ovulation pads.