Since it's not possible to get to Moo Moo farm in the current version, seeing as how the keystone receptacle (AM2) can be exploited, I propose an alternative: A craftable waystone set where the portal would normally arrive. Recipe: 2 eyes of ender, 1 ender essence, 2 vinteum dust, 1 Evil-Looking book, 1 waystone, 2 stone bricks.
Last time I checked, the Moo Moo farm does not exist any longer. Try going on singeplayer and attempting to go there, I've tried it too many times over the years to not be sure that it's 100% gone from the mod.