For about 15 years, about 1980 to1995 we had a Brucilosis and Tuberculosis Eradication campaign (BTEC) here in Aus where I think about 190,000 feral cattle were shot from Helicopters. There is also a huge feral donkey problem in north western Australia. I have heard of sought after Government contracts where up to 40,000 donkeys were shot each year. I think that it not so big nowadays.