Cloning - for herds of identical animals

It seems that there are two possible applications in this area.

On one, we have used animals in this way for a long time, desirable or otherwise the animals live good lives, and in their milk produce the necessary factors. The flocks are controlled, and their genetic modification is not allowed to spread into the main livestock herds as the production of these proteins is an undesirable general attribute.

On two, there are concerns about genetic diversity of the livestock. Cloning on any scale could perhaps would reduce disease resistance, and make whole herds or flocks subject to total wipe out from a virus to which that clone is susceptible.