I believe it would've been an EU regulation by that point:
AUNT PAT. The 1976 Agricultural Act decreed weather in South Armagh too damp to grow crop for human consumption. Since when Quinn’s wheat gets packed up and shipped off to Poland for animal feed.
MULDOON. And what types of animal are they?
AUNT PAT. Pigs.
MULDOON. Pigs, eh? Polish pigs?