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5. CALCULATIONS (ADDENDUM A) 6. DIFFERENCES - OLD PORCUS System vs
NEW Proposal (ADDENDUM B)
The Bruwer (1992) protocol removed the
head from the carcass when calculating The main difference between the old and
lean percentage. This resulted in South the new system is that the intervals between
African percentages being higher than the classes are increased from 2 to 5% to
European values. It was therefore decided accommodate the variability within the
to include the heads this time. class as required in the EU.
Furthermore, Bruwer (1992) used the so- This means that the new P class will be the
called P1 site 45 mm from the midline to same as the old P, O and R combined. The
measure fat and muscle thickness. This was new O class will be similar to the old C and
probably due to the smaller carcasses U while the new R will be the same as the old
prevalent then. In Europe the P2 site is S class. There were no experimental pigs in
preferred 60 mm from the midline. In this last the new C, U and S classes since they are
study the P2 site was therefore used. really fat.
A subsample of 93 carcasses from the 120
According to the EU regulations the experimental carcasses dissected, were
accuracy of the prediction formulas is used to produce the chart below. This
determined by a term called RMSEP which illustrates that only P’s, O’s and R’s were
must be below 2.5. This allows for a plus or found according to the new proposed
minus deviation of 2.5% in the predicted classification system on the same pigs that
lean within a class and also dictates that the had a spread according to the old (current)
intervals for percentage lean between system.
classes should be 5%. For this reason a new
class division similar to that of the SEUROP This new system will be in line with the
system with 5% intervals, is proposed. European system which levels the playing
field for imports and exports.
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