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The Occurrence and Toxicity of Indospicine to Grazing Animals

Fletcher, Mary and Al Jassim, Rafat and Cawdell-Smith, A. (2015) The Occurrence and Toxicity of Indospicine to Grazing Animals. Agriculture, 5 (3). p. 427.

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Article Link(s): http://dx.doi.org/10.3390/agriculture5030427

Publisher URL: http://www.mdpi.com/2077-0472/5/3/427

Abstract

Indospicine is a non-proteinogenic amino acid which occurs in Indigofera species with widespread prevalence in grazing pastures across tropical Africa, Asia, Australia, and the Americas. It accumulates in the tissues of grazing livestock after ingestion of Indigofera. It is a competitive inhibitor of arginase and causes both liver degeneration and abortion. Indospicine hepatoxicity occurs universally across animal species but the degree varies considerably between species, with dogs being particularly sensitive. The magnitude of canine sensitivity is such that ingestion of naturally indospicine-contaminated horse and camel meat has caused secondary poisoning of dogs, raising significant industry concern. Indospicine impacts on the health and production of grazing animals per se has been less widely documented. Livestock grazing Indigofera have a chronic and cumulative exposure to this toxin, with such exposure experimentally shown to induce both hepatotoxicity and embryo-lethal effects in cattle and sheep. In extensive pasture systems, where animals are not closely monitored, the resultant toxicosis may well occur after prolonged exposure but either be undetected, or even if detected not be attributable to a particular cause. Indospicine should be considered as a possible cause of animal poor performance, particularly reduced weight gain or reproductive losses, in pastures where Indigofera are prevalent.

Item Type:Article
Business groups:Animal Science
Subjects:Animal culture
Veterinary medicine > Veterinary toxicology
Animal culture > Rangelands. Range management. Grazing
Deposited On:22 Sep 2015 23:23
Last Modified:22 Sep 2015 23:23

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