The Saiya-Jin have about twice as many slaves as there are Saiya-Jin itself. They take these slaves from planets they've conquered and races they've vanguished. The stronger female slaves may be used for breeding, but it's rare to even find a strong species, worthy of carrying a Saiya-Jin child.
The slaves on this planet mainly take care of the food and cooking. They also run several businesses. Slaves in general are treated well. The slaves are also the ones who run the dinosaur breederies and all of the other businesses and generally fair well, especially when the alien visitors pay their shops a visit. They earn money which they can then spend in the resorts.
Saiya-Jin treat their slaves generally as some nice, exotic pet. However, it is not unusual that a slave accidently gets killed by a young child or just by accident. Saiya-Jin sometimes forget that the strength of other races isn't as strong as their own.