I'm a bit of an MFR fanboy, so I'm mighty glad you asked. .Again MFR is something I've never looked too much into, how would you go about automating this system?
l'll give you a quick run down of my system.
I have 15 cows in a 5x5x6(high) room with sewage collectors for the floor. The sewage collectors feed two MFR wheat farms to create feed for the cows. In the 5x5 there is a cronotyper and a breeder, the breeder "Makes Babies" and the cronotyper moves them into a second 5x5 pen. in this pen there is a Vet Machine with Growth Syringes and another cronotyper, this matures the cows, and the second chronotyper sticks them in a pen with a mob grinder, the grinder kills them and collects the drop and makes mob essence. I store the mob essence in a quantum tank(gregtech), which is then fed into a mfr auto-spawner. This device can spawn any mob you can catch with a safari net.
If you'd like I can put up a screenshot gallery that shows my setup, and I'll send you a link to the gallery.