The Department of Agriculture, NSW, has kindly granted permission for an article on Worms in Alpacas (dated 12th June 2003, PDF, 35KB) to be posted on this website. The author is Anne Oakenful, Technical Officer from the Diagnostic Parasitology Department of the Elizabeth Macarthur Agricultural Institute, NSW Department of Agriculture. Download here.
If you are a newcomer to the industry and/or are interested in further information, we have prepared a document (vet-approved) on our alpaca husbandry practices and general care routine as appropriate for the Goulburn NSW and Southern Tablelands regions. Please to obtain a copy (PDF).
The following information comes from the very informative ‘Info Pak’ book written by Riverina Fleece Testing Services (RFTS) of Albury-Wodonga, and is reproduced with their permission. As we have not had fleece tested for some years, having sold our stock, the following contact details may be out of date, but are included as a courtesy to them. Pleae let us know of any current details so that we may update this page.
John and Val Park
Ph: 02 6026 0551
PO Box 1062, Lavington NSW 2641 or PO Box 1462, Wodonga VIC 3689
Fleece testing accuracy improves with increasing fibre count. For example, the difference between a 1% coarse fibre and a 2% coarse fibre with 1000 fibres is only 20 fibres. This is why the RFTS tests 4000 fibres per sample. OFDA has no equal: it is simply the most accurate.
The Optical Fibre Diameter Analyser (OFDA):
After overnight conditioning, the whole clean sample is cored by multiple kneedles passing through and withdrawing 2mm snippets of fibres.
Fibres are randomly spread on a glass slide and placed on the stage of the OFDA. ALL test results are processed with 4000 fibre counts for complete accuracy of MFD, SD, CVD and %>30µm. Test data is imported into RFTS files and then all test reports are issued.
NOTE: Generally, the lower each of the SD, CVD, SF, CURVE[SD], FEM and CEM values are, the better the fleece within each micron category.
The value of spinning fineness (SF) is derived from the Martindale theory on the effective fineness of wool.
SF = 0.881MFD√[1+5(CV%/100)2]
where MFD = Mean Fibre Diameter
CV = Coefficient of Variation
This formula means that a reduction in CV of 5% has the same effect on spinning fineness as a 1µm reduction in MFD. For example:
21.0µm and CV of 28% = SF of 21.8µm
21.0µm and CV of 18% = SF of 19.9µm
21.0µm and CV of 24% = SF of 21.0µm
A CV of 24% has a zero effect on Spinning Fineness.
The fibre curvature data measured by the OFDA is presented at the top of the histogram. The following example is used in describing the data:
This is the mean fibre curvature and standard deviation of curvature in brackets.
This is the number of fibre snippets measured for curvature. This is less than the sample size set for measuring fibre diameter due to the fact that some fibres in the sample overlap in the OFDA slide and hence cannot be measured for fibre curvature.