Many have been wondering this tribe practice such behaviour but according to themits the best method they have used and worked for them.
The suri tribe which is found in Ethiopiabelieve that their way of sucking a cows private part has always helped them to make the cow produce milk for them with the help of caressing their udders.The suri tribe has used this method of centuries and they say it has helped them alot in receiving many milk for them.
Africans are one clever people with their unique ways to simply their way of living.They always have awkward ways that help them better their lives in everything they do.They may not be exposed more to technology but their methods and cultures open easy ways or way of living that simply everything for them.
Its not the Ethiopian people,even other cultures might have their different ways that they use in such matters but it all worksfor them in their favours.