SCF chief executive Donna Smith said some of the funding was used to pay for marksmen and their ammunition.
But she said culls at their current level were not keeping on top of numbers of geese.
“The numbers are blooming,” she told BBC Naidheachdan.
“I know a lot of people might not agree with that (culling), but we are now at a tipping point where these birds are causing significant damage to the crops and grass in some areas.”
Smith added: “We need to do something so culling numbers is probably the easiest way.
“It doesn’t mean getting rid of them all. It just means getting rid of enough so the two can live in balance.”