As Ian Malcolm tried to figure out the causes of the DX disease, he searched the network that was still active on the island and found InGen‘s procedures for feeding the dinosaurs. He found that all the dinosaurs were fed Goat’s milk in the first few weeks, due to it being very hypoallergenic. From 1988 to 1989, the herbivores were fed macerated plant matter scheduled three times daily. The carnivores were fed ground-up sheep extract, taken directly from InGen’s feed supplier.
Sarah Harding later explained to Richard Levine that zoos never used sheep extract due to the danger of infection from Prion diseases. The Lab on Isla Sorna accidentally fed the dinosaurs a bad batch of infected Sheep extract, but was ultimately unsuccessful. In dinosaurs, this prion disease from the sheep extract was known as DX.
The Lost World by Michael Crichton pg.278,392-393