Livestock adopted in Africa were Eurasian species that came in from the north. Africa's long axis, like that of the Americas, is northsouth rather than eastwest. Those Eurasian domestic mammals spread southward very slowly in Africa, because they had to adapt to different climate zones and different animal diseases.
Quotes about eastwest (2 Quotes)
Eurasia's main axis is eastwest, whereas the main axis of the Americas is northsouth. Eurasia's eastwest axis meant that species domesticated in one part of Eurasia could easily spread thousands of miles at the same latitude, encountering the same day-len