Zebu Cattle - What Happened Approximately 4.2,000 Years Ago?

Around 4.2,000 years ago, Indian Zebu bulls started breeding with female boss Taurus cattle in this region, the fertile crescent region. And we have archaeological evidence in Egypt from approximately 2000 BC of Zebu cattle on pottery and rocks. This all seems to be a set of coincidences that all happen at the same time. This is all interconnected.