We used matrix to sync up 2 gilts and 2 sows. I heat checked them all twice a day and the timing for the first dose lined up perfectly and we bred all 4 one right after the other. When we went to breed them all for their second doses, NONE of them would stand anymore. I don't know what happened. Has anyone experienced this? Did we miss them or could we have just hit them at the perfect time??

I have never used matrix, but i have had them stand for first breeding and want nothing to do with it 12 hours later. Could have been a quick heat. If you got one dose in them you might be ok.