'Celebrity Apprentice' -- Big Sponsor Pulls Out Over Little Trumps' Animal Butchery

Donald Trump's sons' bloody hunting trip in Africa last year didn't just put a dent in the local wildlife population -- it exterminated a lucrative advertising deal on "Celebrity Apprentice" ... by scaring away a big sponsor.

Camping World CEO Marcus Lemonis tells TMZ, the company's TV spots already aired on this season of "Celebrity Apprentice" -- but he insists, "I wouldn't spend another nickel with them."

Marcus adds, "I am totally disgusted by the [hunting] pics I have seen and was surprised to see them ... Money is spent but wow I'm really shocked."

As TMZ previously reported, Donald's sons (Donald Jr. and Eric) went on a hunting safari in Zimbabwe a year ago, killing several animals -- including an elephant, crocodile, kudu, civet cat and waterbuck.