Slave breeding in the United States
Slave breeding in the United States were those practices of slave ownership that aimed to influence the reproduction of slaves in order to increase the wealth of slaveholders.[1]
Slave breeding included coerced sexual relations between male and female slaves, promoting pregnancies of slaves, sexual relations between master and slave with the aim of producing slave children, and favoring female slaves who produced a relatively large number of children.[1]
The purpose of slave breeding was to produce new slaves without incurring the cost of purchase, to fill labor shortages caused by the termination of the Atlantic slave trade, and to attempt to improve the health and productivity of slaves. Engel and Fogerman (1995) found little evidence of slave breeding, but acknowledged that slaveholders wanted to encourage the birth of healthy slave children.
https://en.wikipedia.org/wiki/Slave_breeding_in_the_United_States