Islamic slavery was quite brutal. They castrated the men and only 10% survived. The women were what the Mozlems were after. Lots of white women were enslaved as well! Here is a neat story of a slave rebellion inside the Islamic world you’ve probably not heard about:
http://www.raceandhistory.com/historicalviews/slaverebel.htm
Exactly... which is why in North and South America, we still have descendents of former slave populations.