I try and stick to 3 days in, 4 days out. During the 4 days is when I try and feed. If breeding a male to multiple females, I just alternate weeks. Three days in with one female, 4 days off, 3 days in with the other female, 4 days off, and so on. Also, try and pair when a low pressure system is moving through your area (rain, snow, etc). It gets them in the mood.