Toxicosis in horses after ingestion of hoary alyssum

Raymond J. Geor From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Roger L. Becker From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Edward W. Kanara From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Lynn R. Hovda From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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William H. Sweeney From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Thomas F. Winter From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Jerre K. Rorick From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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George R. Ruth From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Esther Hope From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Michael J. Murphy From SmithKline Beecham Animal Health, Exton, PA 19341 (Kanara), Equine Hospitals Inc, Hastings, MN 55033 (Hovda), Equine and Small Animal Medical Center, Lakeville, MN 55044 (Sweeney), Cannon Veterinary Service Ltd, Canon Falls, MN 55009 (Winter), Rorick Equine Practice, Elmhurst, IL 60126 (Rorick), Department of Agronomy, College of Agriculture (Becker), Department of Clinical and Population Sciences (Geor), and Department of Veterinary Diagnostic Medicine, (Ruth, Hope, Murphy), College of Veterinary Medicine, University of Minnesota, 1943 Carter Ave, St Paul, MN 55108.

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Summary

Fever, limb edema, and laminitis were observed in horses 18 to 36 hours after they consumed hoary alyssum (Berteroa incana) under field and experimental conditions. Clinical signs were not observed in all horses that had ingested the plant. Diagnosis in the field cases was limited to observation of clinical signs and evidence of plant ingestion in hay or on pasture. In most cases, clinical remission was observed 2 to 4 days after empirical treatment, removal of the plant source, or both.

Summary

Fever, limb edema, and laminitis were observed in horses 18 to 36 hours after they consumed hoary alyssum (Berteroa incana) under field and experimental conditions. Clinical signs were not observed in all horses that had ingested the plant. Diagnosis in the field cases was limited to observation of clinical signs and evidence of plant ingestion in hay or on pasture. In most cases, clinical remission was observed 2 to 4 days after empirical treatment, removal of the plant source, or both.

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