Efficacy, persistence and presence of Synergistes jonesii in cattle grazing leucaena in Queensland: on-farm observations pre- and post-inoculation
S. R. Graham A , S. A. Dalzell A , Nguyen Trong Ngu C , C. K. Davis B , D. Greenway A , C. S. McSweeney B and H. M. Shelton A DA School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Qld 4072, Australia.
B CSIRO Livestock Industries, Brisbane, Qld 4072, Australia.
C College of Agriculture and Applied Biology, Cantho University, Campus II, 3/2 Street, Cantho City, Vietnam.
D Corresponding author. Email: m.shelton@uq.edu.au
Animal Production Science 53(10) 1065-1074 https://doi.org/10.1071/AN12301
Submitted: 23 August 2012 Accepted: 17 December 2012 Published: 17 April 2013
Abstract
A study of eight commercial cattle herds grazing leucaena (Leucaena leucocephala subsp. glabrata) pastures was undertaken to determine (1) the efficacy of in vitro Synergistes jonesii inoculum (produced in an anaerobic fermenter) in degrading the dihydroxypyridone (DHP) isomers produced during digestion of leucaena forage; and (2) the persistence of the inoculum in the rumen of cattle following a period grazing non-leucaena pastures.
Cattle were introduced to the leucaena pastures for an initial period varying from 17 to 71 days. Fourteen to fifteen animals were then sampled for (1) urine and blood plasma to determine toxicity status as indicated by concentration of DHP; (2) faeces for estimation of diet composition; and (3) rumen fluid for detection of S. jonesii by nested polymerase PCR analysis. After a further 42–56 days, animals were resampled as before to confirm toxicity status and inoculated with the in vitro S. jonesii inoculum; the herds were then sampled a third time (42–60 days after inoculation) to test the effectiveness of the inoculum in degrading DHP.
Five of the herds were then removed from leucaena pastures for periods ranging from 80 to 120 days and returned to leucaena pastures for 21 days to check persistence of the inoculum as indicated by retention of capacity to degrade DHP.
The data indicated (1) a very slow build up of capacity to degrade DHP isomers on some properties before inoculation; (2) frequent occurrence of high levels of 2,3-DHP in urine indicating partial toxin degradation, both before and after inoculation; (3) a low incidence of detection of S. jonesii in rumen fluid after inoculation based on nested PCR analysis; (4) failure of inoculation to degrade DHP on one of two properties tested; and (5) loss of capacity to degrade DHP on some properties after <4 months on alternative non-leucaena pastures.
It was concluded that while most herds showed some capability to degrade DHP due to some residual capability from previous exposure, they did not achieve the same rapid and complete DHP degradation reported in the 1980s. Nevertheless, it was concluded that the in vitro inoculum was at least partially effective and should continue to be used by graziers until improved sources of inoculum and/or inoculation methodologies are demonstrated.
Additional keyword: mimosine.
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