Mast year for acorns results in toxicosis cases among cattle and sheep.

Restrict livestock access to oak areas during acorn mast years to prevent tannic acid toxicosis.

This article examines acorn toxicosis in cattle and sheep during a mast year, when oak trees produce abundant acorns. Acorn ingestion causes gastrointestinal and renal damage through tannic acid toxicity, leading to clinical signs including anorexia, constipation, diarrhea, abdominal pain, and potential acute kidney injury. The mast year phenomenon creates heightened risk when livestock have access to areas with significant acorn production. Clinical presentation varies with acorn quantity consumed and animal susceptibility. Diagnosis is based on clinical signs, dietary history, and exclusion of other differentials. Management focuses on removing animals from acorn-contaminated pastures, supportive care including fluid therapy, and monitoring renal function. Prevention strategies emphasize pasture management during mast years, restricting livestock access to oak-heavy areas, and providing alternative forage. This case series highlights the importance of recognizing seasonal toxicosis risks and implementing appropriate management protocols to minimize production losses and animal morbidity.

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