Dairy farming could have been happening in Wales as early as 3,100BC, according to new research.
Shards of decorated pottery taken from the Trellyffaint Neolithic monument near Newport, Pembrokeshire, were found to contain dairy fat residue.
The residue could only originate from milk-based substances such as butter, cheese, or more probably yoghurt.
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George Nash, of the Welsh Rock Art Organisation, said it was the earliest proof of dairy farming in Wales.
Project leader Dr Nash said Julie Dunne of the University of Bristol had detected the dairy fat residues from the inner surfaces of the pottery, as well as dating them with 94.5% accuracy to 3,100BC.
"It's incredibly rare to find any archaeological remains such as bone and pottery in this part of Wales because of the soil's acidity," he said.
"So, we can't say for certain that this is the earliest example of dairy farming, but it is the earliest that anyone has been able to prove, using new revolutionary direct dating methods.
"The discovery of this pottery is important because it is right on the cusp of when a new Neolithic ideology was taking hold."