The key appears to be maternal inheritance.

Fukushima's hybrid pigs aren't radioactive mutants but fast-breeding boar-pig crosses that reproduce year-round, creating ...

DNA analysis found Fukushima pig-boar hybrids inherited rapid breeding traits after nuclear incident. A fast-growing ...

A Fukushima mutant pig study shows how escaped domestic pigs rapidly bred with wild boar after the 2011 nuclear disaster.

Scientists have discovered that mutant 'super pigs' thriving in the ruins of a nuclear wasteland have developed alarming new ...

Boffins from Fukushima and Hirosaki Universities have warned a new breed of swine is growing out of control after domestic ...