Two recommendations. 1: 2 condenser, 6 filters, 8 tubes, ~10 redstone, timer, 3 deployers and 3 cows. trap the cows in place, put deployers facing the cows. Put a filter (targeting milk buckets) taking out of the deployer, into a tube and into the condenser. Set condenser to empty buckets, have a filter taking empty buckets out of the condenser and back into the deployer. Set up 3 or these, 2 sharing 1 corner and 1 on top. set it so if there is no room for buckets in the first condenser they will go into the second condenser. Set that to whatever you want. Wire up everything (filters and deployers)with redstone and set timer to minimum(0.2seconds).
I find this produces about 1/3 as much as a full collector array.
