Treatment of clinical signs of perennial rye grass toxicosis in sheep

Research output: Book/ReportCommissioned report

Abstract

Perennial Rye Grass Toxicosis (PRGT) causes significant mortalities in sheep during severe outbreaks and subclinical losses estimated to be in the region of 63M p/a. PRGT is caused by ingestion of a mixture of toxins present in Neotyphodium lolii infested perennial rye grass. The movement disorder ‘Rye Grass Staggers’ is the key clinical sign identifying high levels of the toxin lolitrem B being present in the pasture, a tremorgenic compound that causes the neurological signs, reaches levels sufficient to cause neurological effects. Alleviating the effects of PRGT in grazing livestock is of significant interest to producers and their economic partners alike; a therapeutic intervention effective in the most severe recumbent cases will increase survivability for animals during severe PRGT outbreaks. To identify a potential therapeutic agent a controlled clinical trial was undertaken in which clinical signs of ‘Rye Grass Staggers’ was induced in male lambs which were then treated with the antiepileptic drug potassium bromide using one of two modalities. Animals receiving a single dose of potassium bromide showed significant improvement in their ability to maintain normal movement. Animals receiving a prophylactic dose over 22 days also showed improved mobility. This work suggests potassium bromide to be an effective treatment for Rye Grass Staggers, but more work is needed to confirm the correct application for prophylaxis.
Original languageEnglish
PublisherMeat and Livestock Australia Ltd
Commissioning bodyMeat & Livestock Australia Limited
Number of pages29
Publication statusPublished - 31 Aug 2017

Fingerprint

rye
poisoning
grasses
sheep
potassium bromide
toxins
movement disorders
Epichloe festucae var. lolii
anticonvulsants
animals
therapeutics
dosage
clinical trials
disease control
lambs
livestock
pastures
ingestion
grazing
economics

Cite this

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title = "Treatment of clinical signs of perennial rye grass toxicosis in sheep",
abstract = "Perennial Rye Grass Toxicosis (PRGT) causes significant mortalities in sheep during severe outbreaks and subclinical losses estimated to be in the region of 63M p/a. PRGT is caused by ingestion of a mixture of toxins present in Neotyphodium lolii infested perennial rye grass. The movement disorder ‘Rye Grass Staggers’ is the key clinical sign identifying high levels of the toxin lolitrem B being present in the pasture, a tremorgenic compound that causes the neurological signs, reaches levels sufficient to cause neurological effects. Alleviating the effects of PRGT in grazing livestock is of significant interest to producers and their economic partners alike; a therapeutic intervention effective in the most severe recumbent cases will increase survivability for animals during severe PRGT outbreaks. To identify a potential therapeutic agent a controlled clinical trial was undertaken in which clinical signs of ‘Rye Grass Staggers’ was induced in male lambs which were then treated with the antiepileptic drug potassium bromide using one of two modalities. Animals receiving a single dose of potassium bromide showed significant improvement in their ability to maintain normal movement. Animals receiving a prophylactic dose over 22 days also showed improved mobility. This work suggests potassium bromide to be an effective treatment for Rye Grass Staggers, but more work is needed to confirm the correct application for prophylaxis.",
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year = "2017",
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Treatment of clinical signs of perennial rye grass toxicosis in sheep. / Quinn, Jane; Combs, Martin; Edwards, Scott.

Meat and Livestock Australia Ltd, 2017. 29 p.

Research output: Book/ReportCommissioned report

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AB - Perennial Rye Grass Toxicosis (PRGT) causes significant mortalities in sheep during severe outbreaks and subclinical losses estimated to be in the region of 63M p/a. PRGT is caused by ingestion of a mixture of toxins present in Neotyphodium lolii infested perennial rye grass. The movement disorder ‘Rye Grass Staggers’ is the key clinical sign identifying high levels of the toxin lolitrem B being present in the pasture, a tremorgenic compound that causes the neurological signs, reaches levels sufficient to cause neurological effects. Alleviating the effects of PRGT in grazing livestock is of significant interest to producers and their economic partners alike; a therapeutic intervention effective in the most severe recumbent cases will increase survivability for animals during severe PRGT outbreaks. To identify a potential therapeutic agent a controlled clinical trial was undertaken in which clinical signs of ‘Rye Grass Staggers’ was induced in male lambs which were then treated with the antiepileptic drug potassium bromide using one of two modalities. Animals receiving a single dose of potassium bromide showed significant improvement in their ability to maintain normal movement. Animals receiving a prophylactic dose over 22 days also showed improved mobility. This work suggests potassium bromide to be an effective treatment for Rye Grass Staggers, but more work is needed to confirm the correct application for prophylaxis.

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