herdsman:
(also ‘herder‘; plural: ‘herdsmen’)

a herdsman with his cattle
a man who owns and/or breeds some considerable number of animals, such as cattle, goats, sheep, etc.;
a man who looks after a herd (group) of domestic animals, mostly cattle;
a person who drives/moves herds of cattle from one place to another, usually from the farm/ranch to the cattle-market,

herdsmen with their sheep
After being the chief herdsman for over thirty years on his million dollar family farm, Benson retired from the position and passed it on to his son who is now the chief herdsman.
The word ‘herdsman’ is often used to refer to people in an important or chief position in an organisation, society, camp, etc. to mean he/she is the one to conduct the day to day affairs that’s good for the organisation, as a real herdsman looks after and drives his cattle to good places for the cattle.
As with any other profession, a herdsman’s job has become more dependent on electric and electronic gadgets and other modern techniques that save a lot of time and labour.
Most Tibetan and Mongolian herdsmen near Chinese border complain that their pastures have been exploited and polluted by the Chinese mining activities, pushing them and their herds away from their own land, but there is nothing they can do to stop the invasion.
Many farm owners hire some experienced herdsmen to take care of the cattle during calving season.
