The harness is called a 'Yolk'
a yoke (yolk)
Oxen.
These would be working animals such as Horses and oxen.
A yoke is a wooden beam which is used between a pair of oxen to allow them to pull a load (oxen almost always work in pairs). There are several types, used in different cultures, and for different types of oxen. A pair of oxen is also called a yoke of oxen, and yoke is also used as a verb: "to yoke a pair of oxen".http://en.wikipedia.org/wiki/Yoke
A pair of oxen is called a team of oxen or a yoke or oxen.
A group of oxen is called a team.
The oxen teams were called tandems.
a Himalayan oxen is called a yak
A pair of oxen is called a yoke.
It's a team of oxen.
A baby ox is called a calf.
calf.
Oxen *is* the plural -- more than one ox.