Page 62 - SAPPO Boardpack l 13 May 2020

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ADDENDUM 5

ADDENDUM 5
Comparison of current (PORCUS) classification system with
ADDENDUM 5

Insert Research Report (5 pages)
Comparison of current (PORCUS) classification system with

the proposed (SAFRIC) classification system
the proposed (SAFRIC) classification system
Insert Research Report (5 pages)

Insert Research Report (5 pages)
Comparison of current (PORCUS) classification system with
Background:

Insert Research Report (5 pages)

the proposed (SAFRIC) classification system
Background:
After establishing that the old PORCUS classification system currently in use

After establishing that the old PORCUS classification system currently in use
does not predict lean content accurately any longer at higher carcass

does not predict lean content accurately any longer at higher carcass
Background:
weights, a study tour to Europe was undertaken to find the status quo on
weights, a study tour to Europe was undertaken to find the status quo on

After establishing that the old PORCUS classification system currently in use
carcass classification in the world. This study showed that the principle of

carcass classification in the world. This study showed that the principle of
does not predict lean content accurately any longer at higher carcass

classification based on carcass lean content is still practised in Europe and

classification based on carcass lean content is still practised in Europe and
weights, a study tour to Europe was undertaken to find the status quo on
America so that our system is sufficient and only needs to be updated.

America so that our system is sufficient and only needs to be updated.
carcass classification in the world. This study showed that the principle of

The specialists in Europe pointed out that the calculations used in the PORCUS

The specialists in Europe pointed out that the calculations used in the PORCUS
classification based on carcass lean content is still practised in Europe and

system are made differently to the European system so that our lean values are
system are made differently to the European system so that our lean values are
America so that our system is sufficient and only needs to be updated.

much higher than their values. This is due to the head being excluded from

The specialists in Europe pointed out that the calculations used in the PORCUS
much higher than their values. This is due to the head being excluded from

system are made differently to the European system so that our lean values are ded
carcass weight in the PORCUS system. Furthermore, our classes are divi

carcass weight in the PORCUS system. Furthermore, our classes are divided
into smaller intervals where P class is 70+ percent lean and S class less than

much higher than their values. This is due to the head being excluded from
into smaller intervals where P class is 70+ percent lean and S class less than

about 60% while in Europe the leanest class (S) is 60+% lean while the fattest
carcass weight in the PORCUS system. Furthermore, our classes are divided
about 60% while in Europe the leanest class (S) is 60+% lean while the fattest

class (P) has less than 40%.
into smaller intervals where P class is 70+ percent lean and S class less than
class (P) has less than 40%.

about 60% while in Europe the leanest class (S) is 60+% lean while the fattest

The study of Bruwer (1992)
class (P) has less than 40%. suggested that the P1 measurement 45 mm from

The study of Bruwer (1992) suggested that the P1 measurement 45 mm from

the midline between the second and third last rib be used as the measurement

The study of Bruwer (1992) suggested that the P1 measurement 45 mm from
point for the Hennessy grading probe as well as for the Intrascope. In Europe
point for the Hennessy grading probe as well as for the Intrascope. In Europe

they use the P2 measurement 60 mm from the midline. It was therefore
the midline between the second and third last rib be used as the measurement

they use the P2 measurement 60 mm from the midline. It was therefore
decided to adapt the South African classification system to be on par with the

point for the Hennessy grading probe as well as for the Intrascope. In Europe

decided to adapt the South African classification system to be on par with the
European (SEUROP) system. The study of Strydom et al. 2020 was consequently
they use the P2 measurement 60 mm from the midline. It was therefore

European (SEUROP) system. The study of Strydom et al. 2020 was consequently
designed to take all these differences into account to ensure total

decided to adapt the South African classification system to be on par with the
compatibility.

designed to take all these differences into account to ensure total
European (SEUROP) system. The study of Strydom et al. 2020 was consequently

compatibility.
designed to take all these differences into account to ensure total

It was also realised at the last Board meeting where the new system was

compatibility.

presented, that the names of the classes need to be changed to eliminate the
It was also realised at the last Board meeting where the new system was
chance of confusion. Therefore, SAFRIC is proposed while the SEUROP intervals
was also realised at the last Board meeting where the new system was
It
presented, that the names of the classes need to be changed to eliminate the

and calculations are used. This would level the international playing field as

presented, that the names of the classes need to be changed to eliminate the
chance of confusion. Therefore, SAFRIC is proposed while the SEUROP intervals

far as carcass classification and lean content prediction is concerned.
chance of confusion. Therefore, SAFRIC is proposed while the SEUROP intervals

and calculations are used. This would level the international playing field as

and calculations are used. This would level the international playing field as
far as carcass classification and lean content prediction is concerned.

far as carcass classification and lean content prediction is concerned.
Comparison

The Research Committee was asked to get data from another 1000 carcasses

Comparison
to compare the PORCUS with the SAFRIC system. Lynca Meats kindly provided
Comparison

The Research Committee was asked to get data from another 1000 carcasses

carcass measurements of 19 413 carcasses ranging in weight between 30 kg
The Research Committee was asked to get data from another 1000 carcasses

to compare the PORCUS with the SAFRIC system. Lynca Meats kindly provided

to compare the PORCUS with the SAFRIC system. Lynca Meats kindly provided
and 128 kg with an average of 82.5 kg. The fat thickness (P1) varied between

carcass measurements of 19 413 carcasses ranging in weight between 30 kg
5 and 37 mm with an average of 13.4 mm. These values were used to calculate

carcass measurements of 19 413 carcasses ranging in weight between 30 kg

lean percentage using the old PORCUS equation and the new SAFRIC
and 128 kg with an average of 82.5 kg. The fat thickness (P1) varied between
and 128 kg with an average of 82.5 kg. The fat thickness (P1) varied between

equation to compare predictions. It was then realised that one cannot
5 and 37 mm with an average of 13.4 mm. These values were used to calculate
5 and 37 mm with an average of 13.4 mm. These values were used to calculate

lean percentage using the old PORCUS equation and the new SAFRIC
lean percentage using the old PORCUS equation and the new SAFRIC
compare lean percentages directly because the one was with and one

without the head. By plotting these values on a graph one can see relationship
equation to compare predictions. It was then realised that one cannot
equation to compare predictions. It was then realised that one cannot

and also the effect of scale (size of class) on comparison (See Figure 1).
compare lean percentages directly because the one was with and one

compare lean percentages directly because the one was with and one

without the head. By plotting these values on a graph one can see relationship

and also the effect of scale (size of class) on comparison (See Figure 1).

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