>At 11:30 we have 3 slip matings - the stud clearly ejaculated inside the bitch but the tie did not hold, once he ejaculated on the first time he was out within 5 seconds, the second time he was held in place and still no tie and was out within a minute and the third he was held there for 2-3 minutes and again came out.
You would not have had three breedings here because it's physically impossible. Once the stud dog has ejaculated, he needs time to produce more sperm. How long this takes depends on the dog. Some can produce sperm of adequate quality for one day later, but all will have made more by 48hours later. Immediately though - no. He may get an erection but he won't produce anything. Once a dog has ejaculated, that's your lot for that breeding attempt and you may as well stop until he has had time to make more.
Discharge colour means nothing really.
Dogs will often stand a day or so early, so that there is sperm in there for when the eggs ripen. And slip matings often happen when you are a bit early as well...
If I were you, I would not repeat the very next day but would do 48 hours later. You've already put some sperm in there with the slip mating but you will probably have better timing if you wait 48 hours instead of 24 hours...