Impact of mycotoxins and of a mycotoxin deactivator on alpacas grazing perennial ryegrass infected with wild endophyte (Neotyphodium spp.)

Reed, K. F. M., Vaughan, J. L., Cummins, L. J. and Moore, D. D. (2010) Impact of mycotoxins and of a mycotoxin deactivator on alpacas grazing perennial ryegrass infected with wild endophyte (Neotyphodium spp.). Animal Production Science, 50 9: 902-908. doi:10.1071/AN10068


Author Reed, K. F. M.
Vaughan, J. L.
Cummins, L. J.
Moore, D. D.
Title Impact of mycotoxins and of a mycotoxin deactivator on alpacas grazing perennial ryegrass infected with wild endophyte (Neotyphodium spp.)
Journal name Animal Production Science   Check publisher's open access policy
ISSN 1836-0939
1836-5787
Publication date 2010-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1071/AN10068
Volume 50
Issue 9
Start page 902
End page 908
Total pages 7
Place of publication Collingwood, VIC Australia
Publisher C S I R O Publishing
Language eng
Subject 1103 Clinical Sciences
1106 Human Movement and Sports Science
Abstract Liveweight gain, animal health and the effectiveness of a mycotoxin deactivator were studied on an old pasture that contained 61% perennial ryegrass. Sixty-seven percent of the ryegrass population was infected with endophyte (Neotyphodium spp.). The pasture was fenced into two halves and two groups of 28 alpaca male weaners were rotated between the two plots. Nine to 10 Suris and 1819 Huacayas were allocated to each group. One group was fed a concentrate supplement (100 g/head per day) and the other was fed the same supplement to which was added the toxin deactivator, Mycofix Plus (5 g/100 g). Mean liveweight gain on the low-quality pasture over late summer and early autumn was not significantly (P 0.05) different between the groups. For the control group it was 41 g/day but individual rates of gain ranged from 67 to 0 g/day, depending on the severity of signs of perennial ryegrass toxicosis (r ≤ 0.82, P 0.001). Liveweight gain was independent of neurotoxic signs in the Mycofix Plus treated group. Ergovaline concentration in perennial ryegrass varied from 0.43 to a peak in early autumn (March) of 1.05 mg/kg. Mean urine lysergol alkaloid concentration peaked in mid-summer (January) at 109 ng/mg creatinine (control group) and was consistently lower in the Mycofix Plus group, although the difference approached significance (P ≤ 0.06) only in March. Lolitrem B concentration in perennial ryegrass varied from 0.78 to 1.57 mg/kg. Neurotoxic signs in alpacas were observed throughout the study and peaked in early autumn, coinciding with peak lolitrem B concentration; at this time, 84% of alpacas exhibited neurotoxic signs. Over the 145-day study, the Mycofix Plus treated group exhibited a lower mean rating of perennial ryegrass toxicosis signs (P 0.05). Variation in liveweight gain and signs of toxicosis were not associated with significant differences in liver enzyme activity.
Keyword Creatine Kinase
Deoxynivalenol
Neck tremors
Ryegrass staggers.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Veterinary Science Publications
 
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