According to Foreign Agricultural Service arm of the US Department of Agriculture, Nigeria is not on the list of top 20 cattle producing countries.
So, we cannot see why cattle breeding or cattle grazing should be causing so much of a problem in Nigeria.
In view of the US Department of Agriculture on the list of top 20 cattle producing countries. "India has the largest cattle inventory in the world in 2017 followed by Brazil and China. Roughly 63% of the world's cattle came from India, Brazil and China" yet you won't hear about herdsmen related massacres in these countries.
This is for those saying that this is an economic issue.