What are they doing? Making half animal and half human embryos - 'Chimeras.' Then, the chimera embryos are implanted into the wombs of adult pigs.
Ross says, "If a male chimeric pig mated with a female chimeric pig, the result could be a human fetus developing in the uterus of that female chimera," ultimately giving birth to some kind of part-human, part-pig creature.
Ross reassures not to worry he has it all under control. Sure he does.