What fence is best suitable for an agricultural farm?

You should go for a Solar Perimeter Security Electric Fence.

The advantages of this include:

Fence posts are erected 6 - 8 mts apart depending upon the terrain.

No barbed wires are used. Only plain High tensile (Strong) wire is used.

A long life as the fence is not subjected to physical pressures of wear and tear.

Selective barriers possible. For example, Elephant barriers can be designed to allow smaller animals like cattle to move in and or out.

It is used in more than 165 countries all over the world.

It is the most effective method of fencing, and is safe to all kinds of animals and to human beings.

It is easily constructed and maintained.

It is long lasting and can be modified, extended, shifted and re-erected from one place to another, without loss of materials and waste of labour.

This is the  method of fencing, which can effectively keep all kinds of wild animals out.

It is not dependent on regular electricity supply as it operates on battery.