sentences:  In 1973, the Büren and Bürenkhaan sums were dissolved and partially joined to Bürentogtokh sum.Between 1952 and 1990, Bürentogtokh was the seat of the Delgermörön negdel.In 2004, there were roughly 145,000 heads of livestock, among them 66,000 sheep, 63,000 goats, 8,500 cattle and yaks, 7,800 horses, and 190 camels.