Prevalence of mimosine and DHP toxicity in cattle grazing Leucaena leucocephala pastures in Queensland, Australia

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Contents Vol 52(5)

doi:10.1071/AN11236

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Prevalence of mimosine and DHP toxicity in cattle grazing Leucaena leucocephala pastures in Queensland, Australia

S. A. Dalzell ^A, D. J. Burnett ^A, J. E. Dowsett ^A, V. E. Forbes ^A and H. M. Shelton ^A ^B

^A School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Qld 4072, Australia.
^B Corresponding author. Email: m.shelton@uq.edu.au

Animal Production Science 52(5) 365-372 http://dx.doi.org/10.1071/AN11236
Submitted: 17 October 2011 Accepted: 9 February 2012 Published: 10 May 2012





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Abstract

A postal survey of the level of awareness of leucaena toxicity and an on-farm study of the toxicity status of Queensland cattle herds grazing leucaena were conducted to investigate the prevalence of mimosine and dihydroxypyridine (DHP) toxicity in Queensland. In total, 195 of 356 graziers surveyed responded to the postal survey. Sixty-three percent had inoculated their cattle with in vitro Synergistes jonesii inoculum (produced in an anaerobic fermenter) and 30% of these had inoculated more than once. The remainder used inappropriate procedures. Many graziers (43%) had occasionally observed toxicity symptoms of hair loss and poor animal growth rates. In the on-farm study, the toxicity status of 385 animals in 44 individually managed herds on 36 properties was determined by urine analysis of mimosine and DHP concentrations. No animals were experiencing mimosine toxicity, based on low concentrations of this compound found in the urine. Using the criterion that average herd urine concentrations of DHP >100 μg/mL was indicative of subclinical toxicity, 48% of herds were exposed to subclinical toxicity due to dominant 3,4-DHP (21%) or dominant 2,3-DHP (27%) toxicity; many of these herds had been inoculated with S. jonesii and were thought to be protected. The finding that 27% of herds were excreting high concentrations of 2,3-DHP was unexpected. Statistical analysis of herd-management data revealed that the method used by graziers to inoculate their herds was significantly (P < 0.05) but weakly linked to herd protection status. It was concluded that subclinical 3,4-DHP and 2,3-DHP toxicity remains a problem in Queensland and is likely to be limiting animal production in a significant number of cattle grazing leucaena-grass pastures.

Additional keywords: 3-hydroxy-4(1H)-pyridine (3,4-DHP), 2-hydroxy-3(1H)-pyridine (2,3-DHP).

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