[AlpacaTalk] Re: Micron Testing clarified and EPD
Heather-at the risk of disagreeing with you the information you provided here is not quite accurate. There is an outstanding discussion on the facts and details associated with the various methods of sampling and testing fiber on ALPACASITE intertwined with some great information about EPD's. A quote copied here defining OFDA2000 might clarify our point of disagreement:
The output from an OFDA2000 scan produces 2 distinct reports. One
looks pretty much the same as the kind you get from Yocom-McColl,
showing the staple length, average fiber diameter (measured over the
length of the fiber), standard deviation, co-efficient of variation,
fibers over 30 micron (expressed as a percentage), and a histogram.
The other report shows the average fiber length, variations in micron
along the fiber length, and, maximum and minimum micron readings.
This is obviously more detailed than the first report, and probably
of more use to the breeder, than to a potential buyer, who, as you
pointed out, would probably would not be much in a position to evaluate.
IMO, the average fiber diameter measured over the length of the
fiber, is a truer representation of that fleece's degree of fineness,
rather than just looking at the 2mm butt-cut sample as done in the
Yocom-McColl tests.
So in effect, you get both a Yocum-McColl report and then additional details. The two reports are comparable for the butt-cut. There is value added with the OFDA2000 that is very helpful at assessing the fleece of an Alpaca. Point in case, we select blacks for breeding based upon the minimum micron range understanding the rest of the information, however, we have found that selecting two blacks that have say 13 micron minimum we are achieving a finer micron cria overall then the adults. This information allows us to stay within black for breeding and still get the improvements we are seeking to develop a LINE of true black Huacaya.
Respectfully, Michael
Michael and Margery A. Morack
Greenbriar Farm, Waukesha, WI
262.970.9633
MAm2@wi.rr.com
--- In AlpacaTalk@yahoogro
>
> Yocom McColl also still does the Sirolan laserscan test, which is
> $7.50 per sample, and is IWTO recognized methodology. The OFDA 100 is
> an optical scan, and is also IWTO accepted.
>
> The OFDA 2000 is NOT IWTO accepted testing method.
>
> The OFDA 2000 averages the micron over the length of the staple. This
> means that it will give you an incorrect micron for the animal's
> micron on shearing day. And, since it averages the micron along the
> entire length of the staple, while it may be the mean, it is still
> misleading.
>
> Yocom McColl does scour the samples before testing, it is discussed
> in their website somewhere. :)
>
> Heather
>
>
>
> On Oct 19, 2009, at 7:30 AM, skain1alpaca wrote:
>
> > Hi all, looking for information about micron testing, how to
> > collect samples, where to send them, and any other information
> > related to this would be greatly appreciated.
> >
> > Thanks,
> >
> > Susan Kain
> > Sunset Suri Alpaca Farm
> > Leroy, Ohio
> > skain1alpaca@
>
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posted by Chaddo at 2:01 AM
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