Thousands had signed a PETA position against the 34,490 sq ft free-range egg production facility, describing it as a “chicken prison”.
But on 1 September, the Isle of Anglesey County Council’s planning committee was not swayed by the 18,000-signature document, which was submitted to the local authority in 2020.
The applicant had made clear that the egg production facility would be for free-range birds, which would be able to exit the building and roam the grounds as they liked.
Those grounds would be protected by an electric fence to keep predators away.
The now-approved structure will sit on part of the 310-acre Cae Mawr farm, which also has cows and sheep.
Only one councillor present at the planning meeting objected to the scheme, which was championed by Cllr Eric Wyn Jones.
“Angelsey is the mother of Wales and there is room to feed the nation,” Cllr Wyn Jones said. “When you are next time in a shop grabbing half a dozen eggs, you can say you were helping this business to get on the shelves.”