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Thursday, January 9, 2014

Ivy Named Among ARI's Top 5 EPD Trait Leaders for 2013


Our Gianna's Peruvian Ivy has been named amongst ARI's Top 5 EPD  Trait Leaders in 2013 and will be featured in a screen show, at the Nationals Conference in Harrisburg PA this coming March 14-16th; along with the other trait leaders, when you first enter the complex.

When her fiber sample was submitted and tested from her 2013 shearing she was ranked  #3 out of the 5 for the trait SDAFD - Standard Deviation Actual Fiber Diameter - out of a total of 27776; we are so happy for her!

ARI's EPDs or Expected Progeny Differences are calculated on nine fleece traits collected from standardized fiber analysis.

Here is an explanation of the trait in which she is #3!

Standard Deviation (SDAFD)

When AFD (Average Fiber Diameter) is measured from a sample of fiber collected from the mid-side of the alpaca, a four by four inch sample is taken and kept in staple alignment. The fiber testing laboratory maintains the staple configuration and cuts across the base of the staples generating many 2mm snippets which are measured using an analytical instrument. A histogram is generated which shows the number of fibers, as a percent of the total counted, in one or two micron increments. The base of staple AFD provides data on the fleece at a given point in time (shearing). The use of base of staple measurement supports contemporary group quality, critical to the development of valid and accurate EPDs.

Standard deviation of the set of measured fibers is also determined at this time. SDAFD shows how much variation or dispersion there is from the average (mean). The smaller the standard deviation the more uniform is the sample.

The SDAFD EPD aides the breeder in selecting animals which produce uniformly sized fibers. A negative EPD value indicates that the animal’s progeny will have, on the average, more uniform fiber diameter than the breed average.

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