With the babies out of the way, the facility collected the mother monkeys' milk, using human breast pumps, to sell as well.
Roebuck quit his job after just two days because he was so horrified by what the company was asking him to do to the long-tailed macaques.
"When I got involved in that, I knew I just couldn't live with myself if I was going to be doing that," he told WINK News, adding that the facility had two deep freezers filled with baby monkey parts.
The procedures could be illegal as the facility's land is zoned for agriculture, which is already a stretch considering monkeys aren't agricultural animals.
And a USDA report obtained by WINK News last week, which confirms Roebuck's account, reveals that the facility has carried out hundreds of experiments and procedures on its monkeys unbeknownst to local officials, which could violate zoning restrictions.