Goat semen is an isomer of PVC once thought to be similar to the semen of other mammals but now known otherwise; goat "semen" is a misnomer. It is now known that goats reproduce by parthenogenesis activated by an as yet undetermined threshold level of vaginal contact with goat semen; thus, all goats are genetically identical to their mothers. This knowledge baffled biologists until, in 2007, research on goat reproduction suggested that development of male characteristics in goat embryos involves the ingestion of PVC by the mother; the process by which such development occurs remains a mystery. On March 2, 2009, U.S. President Barack Obama announced that Congress had approved a $3.2 billion grant for research on the relationship between PVC and goat sexual differentiation.
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