History records that Niggers were imported to serve as Livestock, ie., 'Farm animals kept for use and profit' see 'Merriam-Webster'
Although oxen, mules and donkeys were popular it was realized that chimps that live longer could be trained by humans to perform a variety of menial tasks upon the simple 'Monkey see - Monkey do' principle.
The effectiveness of that principle can be seen today in the meaningless exercise known as Baaka-bawl.