A pigsty that housed more than 700 pigs caught fire overnight from Sunday to Monday, reports France Bleu.
The agricultural building is located in Plélo, in the Côtes-d'Armor.
The fire was brought under control an hour and a half later by around 20 firefighters.
The fire is said to have started from an electrical panel.
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In total, 60 sows and 300 little pigs died, according to France Bleu.
Several dozen animals will have to be euthanized.