In order to study the compensatory renal function in 6 Korean black goats with 75% reduction in renal mass, some blood chemical values were determined and pathological changes were examined. The results were as follows : 1. BUN level increased significantly from post-operation day 1 through day 30(p<0.01) compared with pre-operation level. Serum creatinine level increased significantly from post-operation day 1 through day 26(p <0.01 ) compared with pre-operation level and remained higher than pre-operation level at day 30(p <0. 05). 2. Serum calcium level increased significantly from post-operation day 4 through day 7(p<0.01) compared with pre-operation level and remained higher than pre-operation level from post-operation day 8 through day 14(p<0.05). Serum phosphorus level decreased at postoperation day 4,5(p<0.05 ) compared with pre-operation level. 3. RBC counts decreased at post-operation day 2. 3, 5. to 30(p<0.05), PCV decreased at post-operation day 2, 3, 5, 7, to 30(p<0.05), hemoglobin level decreased at post-operation day 2, 8, 14, to 30(p<0.05), compared with pre - operation levels, respectively. 4. The ventral half of the right kidney was infarcted by the ligation of ventral branch of right renal artery.