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6% Index
The use of RAMPOWER Standard Indexes has
become commonplace in the Merino industry.
At Stockman Stud we have assessed our current position and breeding
objectives and have incorporated the 6 % Index within our current selection
process.
Indexes are used to compare animals on their
measurable traits relating to desired breeding objectives.
Three figures are used in the 6% index formula; Fibre Diameter (FD),
Co-efficient of Variation (CV), and Greasy Fleece Weight (GFW).
If an animal has the average FD, CV and GFW of the mob being assessed it
would score 100. Any variations
from the mobs averages will affect the animal’s score. The greater score, the more consistent the animal’s figures
are with achieving the desired breeding objectives.
Current
6% Index figures in the catalogue have been calculated from the FD, CV, and GFW
recorded at ram shearing on 5th June 2006.
The graph below displays three alternative indexes
used in the Merino industry and their long-term effect on Fleece Weight and
Fibre Diameter.
The three basic options and their long-term breeding
objectives are explained below:
A maintain FD and near
maximum GFW gain: 3%
B moderate FD reduction and high GFW gain: 6%
C large FD reduction and small GFW gain: 12%
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