Predicting pork loin chop yield using carcass and loin characteristics

Area of Science:

• Meat Science
• Animal Science
• Agricultural Science

Background:

• Pork loin yield is crucial for meat processors and consumers.
• Accurate prediction of boneless pork chop count from carcass measurements can optimize processing and profitability.
• Carcass length is traditionally assumed to correlate with loin length and subsequent chop yield.

Purpose of the Study:

• To evaluate the predictive capability of pork carcass length for the number of equal-thickness boneless chops obtained from a pork loin.
• To compare the predictive power of carcass length with other loin measurements, including weight and dimensions.

Main Methods:

• Collected data from 1,238 commercial pigs marketed at 138 kg average weight.
• Measured carcass length (anterior symphysis pubis to anterior edge of first rib) 1 day postmortem.
• Fabricated boneless loins, aged them for 14 days, then measured stretched and compressed lengths before slicing into 2.54 cm chops.

Main Results:

• Carcass length explained only 15% of the variation in the number of boneless chops.
• Boneless loin weight (33%) and compressed loin length (28%) were stronger predictors than carcass length.
• A combination of loin weight, compressed length, fat depth, and carcass length explained 45% of the variation in chop number.

Conclusions:

• Pork carcass length is an unreliable predictor for the number of boneless pork loin chops.
• Boneless loin weight and compressed loin length offer superior predictive value for optimizing pork loin processing.
• Further research incorporating multiple carcass and loin parameters is recommended for improved yield prediction models.