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> Cattle cannot live by rainfall alone.

Of course they can, as long as you don't have too much of them. Animals in the wild live on rainwater alone just fine.

Also Normandy isn't in the UK, it's in France. Different countries have different practices around animals.

They also require something to feed on, like grass. Water has next to no nutrients or energy.

By "on rainfall alone", I meant "with no exterior food production". Of course you need land on which grass can grow and sunlight.