The male can breed 3 days on, 3 off (I usually do 3 on/4 off because it works out to a week, and I like that better). But each female only needs to be bred once a month. You could get by with even fewer breedings if you had an ultrasound or were really confident with palpating. Hopefully that makes sense...87.7 would be fine for BP eggs. You can even go slightly lower if you need to (I don't know what GTP eggs need).