New Zealand Journal of Agricultural Research abstracts
Effects of estimation accuracy on potential payment premiums for superior beef
carcasses
R. W. PURCHAS
Institute of Food, Nutrition and Human Health
Massey University
Private Bag 11222
Palmerston North, New Zealand
D. J. GARRICK
N. LOPEZ-VILLALOBOS
Institute of Veterinary, Animal and Biomedical
Sciences
Massey University
Private Bag 11222
Palmerston North, New Zealand
Abstract Knowledge of saleable meat yield (SMY%) at the time
of carcass classification enables payments to be made on the basis of carcass
saleable meat content. This study determined the extent to which improved
accuracy of estimating SMY% enabled larger premiums to be paid for better
yielding carcasses. A population of 1000 carcasses was simulated for true SMY%
values (275 kg carcass weight; mean SMY% of 66 with a standard deviation of
3.0) as well as estimated SMY% values when accuracies in terms of residual
standard deviation (RSDs) ranged from 0 to 2.5. A consequence of the
requirement that estimates of SMY% be unbiased was that variability of the
estimates was less than that of the true SMY% when estimation was imperfect.
Premiums that could be paid to the top 5% of carcasses relative to the average
increased by 5.8, 9.2, and 9.7 c kg-1 as the RSD decreased from 2.5
to 1.0 for five-step, eight-step, and smooth payment systems, respectively. The
rate at which potential premiums increased with decreases in RSD values was low
at high levels of accuracy (RSD values below about 1.0). The potential premiums
for the top 5% were highest for the smooth payment system with an advantage
over the five-step system of 24% at an RSD of 1.0 and 28% at an RSD of 2.0, but
the size of the advantage varied with the proportion of carcasses considered.
It is concluded that the benefits that may be derived from using a smooth
payment system rather than a stepwise system will often be more easily attained
than those from improving the accuracy of estimating SMY% and may be as great.
Keywords carcass classification; saleable meat yield;
simulation model
New Zealand Journal of Agricultural Research, 1999, Vol. 42: 305-314
0028-8233/99/4203-0305 $7.00/0 (c) The Royal Society of New Zealand
1999
PDF file of entire paper: medium quality (765K); (scanned from paper original: notes about this process)
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