Leanred a lesson this week. Seems that with CHF after they have it more or less under control you can still AI the easy quick cows, but only one. If you get the hard ones you'll run out of energy/strength before you can get it done. And even with easy ones you can;t do 2 even with a 10 minute break between them. Seems to take a whole lot more out of you then you would think.