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Food, fibre and pharmaceuticals from animals
REVIEW

Cysteamine: a human health dietary additive with potential to improve livestock growth rate and efficiency

M. C. Barnett A B C and R. S. Hegarty B
+ Author Affiliations
- Author Affiliations

A School of Animal and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW 2678, Australia.

B School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.

C Corresponding author. Email: mbarnett@csu.edu.au

Animal Production Science 56(8) 1330-1338 https://doi.org/10.1071/AN15339
Submitted: 2 July 2015  Accepted: 6 October 2015   Published: 8 June 2016

Abstract

Cysteamine is a biological compound produced in the gastrointestinal tract and hypothalamus of all animals that acts on the somatotrophic axis. Cysteamine is finding increasing application in human medicine and also as a natural, in-feed growth promotant for monogastric and ruminant livestock that increases feed conversion efficiency, growth rate and leanness. It improves nutrient digestion and absorption by increasing portal-drained viscera blood flow and net portal absorption, while also reducing gastroenteropancreatic, plasma and hypothalamus concentrations of the inhibitory hormone, somatostatin (SRIF). Dietary inclusion rates required to achieve growth responses are typically about 10 times higher in ruminants than those required for pigs, but it is unclear whether ruminal breakdown of cysteamine is contributing to this difference. While short-term stimulation of growth, milk production and improved feed use efficiency are apparent, studies over longer periods are required, especially in breeding animals, due to the process of SRIF depletion being reversible. This review provides an overview of cysteamine’s mode of action in improving nutrient utilisation and its application in human nutrition and health, as well as its potential use as a growth promotant in the livestock industries.

Additional keywords: endocrine, livestock production, sheep, somatostatin.


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