Last year he had 39 cows - 25 cows - 6 cows = <<39-25-6=8>>8 cows.
This year after the number of the cows has increased he has 8 cows + 24 cows = <<8+24=32>>32 cows.
After he bought more cows he now has 32 cows + 43 cows = <<32+43=75>>75 cows.
After his friend gave him cows he now has 75 cows + 8 cows = <<75+8=83>>83 cows.
#### 83