Nigerian dwarves only require 1/3 to 1/4 the amount of space and feed as the standard size dairy goats. The number of goats you can keep in an area really depends on how much hay you want to feed and how you feel about dewormers. If we keep four bucks in a 64X64-foot pen, they will eat down all the grass, which isn't a problem if we're willing to feed them a couple flakes of hay every day.
(We have since added additional buck pens of the same size, so they can be rotated.) Our does never get hay while outside in the summertime, because they are in a 2-acre pasture, which has so much grass, we have to cut it! The other issue in a small space is parasites. If goats are in a small area, you could find yourself needing to deworm them monthly, and in a fairly short amount of time, you could find yourself with internal parasites that are resistant to chemical dewormers.
If you want milk goats, you will have to consider the fact that most dewormers are not approved for use in milking goats, ... more.
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