From:
A Dulce Base Security Officer Speaks Out
Q - What do the
aliens do with the cow blood and other parts from mutilated animals? Do they need these fluids for research or survival?
A - The aliens use the blood and body parts for formula to keep them alive [their food] and for use in the growing vats, and for the artificial wombs. Plasma and amniotic fluid are the two most vital ingredients for their lives. Also, the ’sap’ of some plants can keep them alive for months. Most of the plants are parasitic in nature, but red grapes and okra plants can also be added to the formula to keep them alive, if they have no ’regular’ formula.
The 1947 human-alien pact agreed that both humans and animals are free to take by aliens and do whatever they want with them, and we get technology in return.