Page 63 - SAPPO Boardpack l 13 May 2020
P. 63
From Figure 1 it can be concluded that all the P carcasses and most of the O
carcasses will be represented by the new S class. This relates with the current
practise of grouping P&O in the same price category. A part of the old O class
along with all of the R carcasses will now be in the new A class. Likewise, C&U
end up in the new R class with very few endings in the new R, I and C classes.
The new C is not even shown on this graph.
Figure 1: Comparison of PORCUS with SAFRIC classes using 19413 observations
From Figure 1 one can also compile a comparative table where the middle
values of percentage lean in the old classification system (where the head
weight is omitted from carcass weight) are used to calculate the percentage
lean in the new system, where head weight is included in the carcass weight.
From this table it is clear that the difference in lean percentage is higher in
fatter carcasses. The reason for this phenomenon is probably that the new
formula discriminates stronger against fatness than the current formula that
drifted over time as carcass types (size or weight against fatness) changed
since 1992.
Old % Lean New % Lean Difference
70 P 62.0 S 8.0
69 O 60.3 S 8.7
67 R 56.8 A 10.2
65 C 53.4 F 11.6
63 U 49.9 F 13.1
61 S 46.5 R 14.5
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