[Beltalowda]

> Pastoral lands are pastoral, and not arable, usually because they are not suitable for arable cropping.

There is plenty of livestock raised on arable land though. The exact number of "arable land used to raise livestock" will probably differ widely per region; pretty much all of the Netherlands is arable as one extreme example. Many of the hills in, say, Ireland or Britain where sheep are grazing are not.

More importantly however, as you mentioned you need a multitude of arable land for any pastoral land since your livestock has to eat. You don't need this, but no way we can raise enough livestock to meet demand on self-sustainable pastoral lands, and it's more expensive too so there's that.

I don't think it's not mentioned because it's "inconvenient", but because it's a red herring and not really very important.