New Zealand Journal of Agricultural Research abstracts
Design and application of a cusum quality control chart suitable for monitoring
effects on ultimate muscle pH
A. B. PLEASANTS
D. G. MCCALL
G. W. SHEATH
AgResearch, Ruakura Research Centre
Private Bag 3123
Hamilton, New Zealand
Abstract The cumulative sum, or cusum, chart is introduced
for on-farm monitoring of meat quality traits. The average time over which
production is satisfactory or in control (average run length) is defined for
the cusum chart and the calculation of this statistic discussed.
Data from 9958 Angus and Hereford steers slaughtered at Manawatu Beef Packers
(AFFCO) between February 1993 and February 1994 were used to calculate fixed
effects and a frequency distribution representing uncontrollable variation in
ultimate muscle pH. A cusum chart for on-farm monitoring of ultimate muscle pH
is constructed from this information. A procedure is given for correcting the
cumulative sums of unequal sample sizes to a measure suitable for on-farm
monitoring of traits of interest.
The role of the cusum chart as an objective tool in farm monitoring programs
is discussed, especially for applications of improvement in the quality of
carcasses supplied by a farmer to a meat processor.
Keywords cusum chart; farm monitoring; quality assurance;
ultimate muscle pH
New Zealand Journal of Agricultural Research, 1998, Vol. 41: 235-242
0028-8233/98/4102-0235 $7.00/0 (c) The Royal Society of New Zealand
1998
PDF file of entire paper: medium quality (594K); (scanned from paper original: notes about this process)
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