The full name is Khödöö aj akhuin negdel (Mongolian: Хөдөө аж ахуйн нэгдэл = Agricultural association).
The first attempts at agricultural collectivization in the Mongolian People's Republic were made in 1930-32, but failed miserably.
Mongolia's livestock population decreased by around a third and the forceful manner in which collectivization was conducted lead to uprisings that could only be quelled with the help of the Soviet Union.
The number of negdels was gradually decreased so that in time they became identical to sums both area and population-wise.
After the dissolution of the Soviet Union and the Mongolian Revolution of 1990, the herds were privatized again and all negdels dissolved.