Seasoned horse breeders know the potentially dangerous effects of grazing broodmares on pasture containing endophyte-infected tall fescue: agalactia (poor milk let-down), dystocia (difficulty foaling), thickened placenta (“red bag” foal), and even foals that are born weak or dead.

But veterinarians know less about another potentially toxic substance that could be lurking in broodmares’ feed: a mycotoxin called zearalenone…....
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